I honestly don't know much about regen, however I tend to slot Health with 3 slots in my DA - INV - SR scrappers to try allocating the unique enhancements of Numina's Convalescence (+regen), Miracle (+regen / +recovery) and another set I can't remember right now that also grants +regen on its unique enhancement. Not sure if these are that critical on a regen scrapper though, although for sure it would maximize the main feature of the set which is the regeneration.
I have a regen Stalker and I might be able to help a little.
The answer is yes. I have fast healing slotted with 3 health and it is rather golden. Throw in the regen bonus from Health slotted 3 times with more Healing and its pretty good. But the fun doesn't stop there if you're willing to look into the new Invention Sets and want even more Regen. While unique enhancements are great, they're rare and very expensive on the Black Market. The cheaper alternative?
I'm almost done with my goofy Invention Sets for Dummy FaQ, but for regen boosts in Melee builds....Regen Scrappers and Stalkers really get the best regen options of all time. Set bonuses DO go over the enhancement cap. So instead of trying to complete one set or spend all your infamy on a rare, try just to slot two from a set in your powers. For example, all your healing powers can take either Numina's Convalescence or Triage Invention Healing Inventions. Both those sets give a regen bonus right off the bat, even if you only slot two from the set in the same power. Triage give only 4% regen bonus while Numina gives a whopping 12%...but its harder to get. So, just focusing on your Regen, you can do the follow:
By putting two Triage each in Health, Fast Healing, Integration you get a 12% Regen bonus on top of the inherent bonuses your powers give you.
By putting two Numina in health, Fast Healing, and Integration, you get a smooth 36% Regen bonus on top of everything.
Even better, if you have 4 slots in all those powers you can put both two triage and two numina in all of them to give yourself an inherent 42% regen bonus. The joys of set bonus stacking.
But it doesn't stop there if you want to be regen king. Since you're a melee archetype, there's a great (and only uncommon, not rare) invention set for Melee called "Pounding Slugfest". The bonus for only slotting two of this kind into a melee power is a 8% regen bonus. Since you probably have 5 melee powers by now (my lower level stalker only has 4 but that'll be fixed in a little while) you can get this bonus a maximum of five times for max bonus of 40% regen. AND this is on top of those regen bonuses I mentioned earlier for healing AND on top of the bonuses inherent to your powers.
So, in a perfect Invention Set build with Pounding Slugfests, Triage, and Numinas only slotted in pairs (not full sets) you can get a scary 82% regen bonus on TOP of Health, Fast Healing, and Integration. I don't know if anyone NEEDS that much regen, but dear god, it's easier to get than you'd think. Since you're not trying to collect sets you can simply snag the two "common" parts of the Invention Sets and ignore the rares....thereby beating the "gotta get them all" mindset and, well, kicking tail in regard to regen. (Funnily enough, this assumes your build only has fast healing, Integration, and Health. By slotting Triage/Numina in more healing powers your regen bonus would be even higher...)
By the way, I'm not an authority on Inventions or anything and my math might be off....check it out for yourself on the Black Market. The Set bonuses are there and with a little smart slotting, you can get something crazy put together.
-jared
PS: The Regeneration Rare in Numina is really worth the effort though. It give an inherent 20% regen bonus...AND if you place it next to another Numina IO that bonus jumps to 32% because of the set bonus. That means that, just looking at Set bonuses which so far don't have a cap as far as we know, you can get a 102% regen bonus on top of all your powers if you are lucky enough to get that rare numina regen enhancement. So. Very. Scary.
Damn, looking back on this, I hope I'm making sense. Inventions are great, they just take a bit of sorting out.
Edit: The flaw of what has been proposed here is that no Invention Healing Sets have more than one "pure" healing Enhancement. So you won't enhance the actual power as much as you would with two SO enhancements, but the set bonus applies to your complete regen, so I think it balances out. Ultimately its up to you. Even better, when people look at you in the info screen, they'll see your set bonuses. Which will literally just read: +Regen, +Regen, +Regen, +Regen, +Regen, +Regen, +Regen, +Regen (and +Regen, +Regen, +Regen if you're crazy and do both Numina and Triage).
Just to clarify something, the reason the above works is because those set bonuses give different numbers. In this case, 4, 8, and 12 to regen. Avernal had this to say:
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Just bear in mind it's the bonus that has the five stacked limit, not the specific set. So you can have 12% regen up to five times, from any set that grants that particular bonus, but after that it doesn't matter what set you use; any further 12% bonuses would be giving you nothing. (So it's good to check for sets with similar bonuses to what you're after but without the 12% regen at this point)
That said, different percentages are counted as different buffs, so you can have a 12% regen bonus five stacked AND a 10%, and an 8% so on so forth. Adds up very nicely.
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Typical regen scrapper wisdom says 3-slot them both.
Fast Healing FIRST. Then Health if you have slots left.
Fast Healing is about twice the +regen bonus of Health.
With IOs, well... You have a fair bit to play with.
+ Scirroco's Dervish (PBAoE damage) is good, with +10% Regen for 2 Slots.
+ Devastation (Ranged) is good, with +12% Regen for 2 Slots.
+ Numina's Convelescence in your heals is great, with +12% Regen (2 Slots) and 1.88% HP (3 Slots).
+ Mako's Bite (Melee) and Crushing Impact (Melee) are fairly good, since on the way to the damage/accuracy (4-Slot) bonus you'll pickup some +HP... which will indirectly boost your regeneration rate.
The BEST POSSIBLE slotting I've seen for Health is:
Numina's Convel: Heal (level 50, 42.4% to all)
Numina's Convel: Heal/End (level 50, +26.5% to all)
Numina's Convel: +10% Recovery/20% Regeneration
Miracle: Heal (level 40, 38.6% to all)
Miracle: +15% Recovery
Regenerative Tissue: +25% Regeneration
= 107.5% Healing Enhancement (+78.5% Regen)
Set Bonuses: +2.5% Recovery, +12% Regen, 1.88% HP.
Procs: +45% Regen, +25% Recovery
Total = 135.5% Regen, 27.5% Recovery, 1.88% HP.
I think it really comes down to being practical. Mael's example is kick-[censored] optimal, but really it comes down to how much infamy you have kicking around...because last I checked most of the regen procs were selling for something in the crazy millions. For good reason.
-jared
Speaking from a DM/Rgn POV if you have the slots do it. But if you do have the sots you are lacking somewhere else.
Resilience wants minimum of three slots to get uniques from Aegis, Impervium Armour & Impervious Skin.
Unless you stick with SS and have no other travel power the 2 extra slots in QH (Health gets a better bonus) can be used to greater effect elsewhere.
See here for a massively detailed look at Health from the US forums:
Scrapulous's Guide to Health.
�How do I like my MMOs? I like them the way Paragon Studios used to make them.� - a fitting tribute from kiasa.org
EU, Union mostly.
Recently on my level 34 MA / Regen i slotted Interigation with 3 heals because of some advice from a freind, should i do this with health and fast healing aswell? i have some attacks i need to slot with acc's though =\.
(( man, if only IH was a toggle still :P ))