So, I ended up going ahead and crafting/AHing out a set of "common" IOs. Pretty noticeable performance increase, and I only spent 2 of my 7.5 mil. For attacks, I went 3 dam, 1 acc, 1 end, 1 rech. Might tweak that a bit as I go(eg I might throw another acc in if I'm missing too much). For passives, I just put in more of whatever stat they boost. For toggles, mostly I'm at a single -end in each so far.
I'll probably start working in including set IOs as I level. When it comes to sets, what do I need to know? My current understanding of high priority set IOs to go for:
For endurance recovery, Panacea/Performance Shifter.
For recharge, Luck of the Gambler(sounds kinda like I want to slot this in as many places as I can fit it).
Archetype enhancements. I'm playing a Stalker, so both of the procs from these sound incredible.
Anything else I should prioritize? And what do I need to know about buying/crafting/slotting them?