Mine has Spiritual, after Ageless you won't have end issues anymore.
You can figure out in Mid's which sets have endred on them, but one important thing to remember is that slotting your attacks with some endred is more effective than slotting your toggles. Attacks are the real end eaters, many people forget that and only slot the toggles (which of course need some endred too, I go for 40-50%, a bit more in damage auras)
Firstly I need to know what you're building this toon for. I will assume a mixture of content and not solely farming, so I'll answer along those lines.
I run both farm and normal content on my SS/FA (set at any difficulty /*8) and don't get more than two or three seconds of low endurance. A lot of people fall into the trap of seeing the frankly heinous end cost of SS/FA and think "Must reduce end cost/increase recovery ASAP!" this isn't the optimal way to build an SS/FA because all those endurance cost reductions or recovery increases are bonuses that could be used to increase recharge.
I took the spiritual alpha to Tier 4 (2/3 45% rech, 33% (?) healing) and built my build around reaching 32.5% defence against all positions. I use Barrier Core Epiphany to achieve a sustainable 35% minimum defence against all positions, this means that just one small purple inspie softcaps me to everything except non-positional moves (almost none of those exist). This is how comes I can solo the entire platform, including both Romulus and Requiem AVs, on the penultimate ITF mission in roughly five minutes: they can't hit me and I can heal for up to 56% of my health every 11 seconds.
So why do I have so little trouble with endurance management? Simply put, my Consume recharges every 50 seconds and with only two targets in range it puts me at maximum endurance. There are two or three seconds sometimes where I'm stuck using Punch and Burn, but that's still over a thousand points of damage against a single target between those moves and my +recharge proc in Punch will usually proc (since I can 'cast' Punch once every 1.3 seconds) and recharge my Consume.
My recovery on its own is roughly 2.2 endurance per second, once consumption is factored in, which rises to 2.4 Es-1 slightly over a quarter of the time (Consume has a secondary '15s 10% recovery bonus').
In short, you're aiming for +recharge to counter endurance troubles without damaging other aspects of your build. A major part of playing an SS/FA is to get Burn to perma because of its gigantic damage per endurance cost (made even tastier by the Reactive Interface), so building for -endurance cost or +recovery specifically will damage your ability to avoid damage, heal up and dish out damage. Your endurance management will come largely from having consume up precisely when you need it (and really learning the end cost per activation of your powers so that you can tailor your attack chain to your consume uptime).
Here is my build as reference:
http://www.cohplanner.com/mids/downl...B5FF03E13DFAF3
I've started running Incarnate content, and not sure for farming what is the best for my Alpha? Cardiac with recharge? Wouldn't that just make my end issues worse since I'm firing powers off faster?
I have run a lot with a DM/FA brute, and he never has end issues and only uses Body mastery PP to handle his end. I've never read of SS taking body mastery, so is there that much of a difference in End usage between DM and SS?
What are some sets that I should be slotting for End reduction?
Thanks