I did the same thing. I have not played my Spines/Invul in years and recently pulled him off the shelf, did a respec, and added IO's to his build. It was kinda nice playing him and made me remember how it was when I was lvling him up.
Proton Sentry Peacebringer:lvl 50+++ - Human Build / Triform Build
Quasar Sentry Warshade:lvl 50+- Human Build / Triform Build
Red Katipo Arachnos Soldier:lvl 50+++ - Crab Build / Bane Build
Black Katipo Arachnos Widowlvl 50+++ - Fortunata Build / Night Widow Build
Well, first thing's first. You'll want to take him redside temporarily to pick up Soul Mastery. It comes with Shadow Meld. Take that power, slot it, and love it.
Now, for IOs you'll want a very high global recharge because Regen benefits greatly from getting all those click powers up more quickly. You may actually want to try getting yourself to 32.5% defense to something. That allows you to softcap with a small purple. For general play, melee defense would probably give you the most coverage. Are you planning on getting incarnate powers? If so, Agility Alpha may give you a little wiggle room to still reach good recharge times and 32.5% defense. The other option is Spiritual Alpha, which gives even more recharge and some healing but offers no defense. I'm not sure which of the two would be better.
If you don't get some replies before the weekend I might try to put a build together for you then. It's finals week for me right now so I don't have much spare time, but I've been looking for a good Regen character to try out so building one would actually help me too.
A good thread to skim through would be Werner's thread about Kat/Regen builds. You don't have Divine Avalanche, so your build strategy will differ slightly. It's still a good place to get some reference builds for /Regen.
@Rorn ---- Blue Baron ---- Guardian
so ive decided to server transfer my first 50 hero its a ma/regen scrapper i havent played him since IO's came out so i was wondering if anyone had some advice on io'ing him out any build's i can use as a drawing board i know i need alot of recharge for regen but not to sure where to start.