Need some help/suggestions on where to start for upgrading.
I doubt this is the best set in game for all content but it's an easy goal for you
ItemSet 334044
-you can get dex/agi/crit dmg/dual wield to the cape using
Refractive Crystal
-you can get dmg+16 + acc+15/attack+15 +WSD+4%/Critical hit dmg +5%/Critical hit rate+4% on the daggers
-you can get
*attack+20 acc+20
*Critical hit rate +3%
*Critical hit damage+3%
all together, on each piece of taeon armor.
so all in all, it's a very valuable set for many ifnot most of your macros and it's all thief soloable. (video of thf soloing below) the new skirmish drops wings to get weapons/armor but also drops the armor itself) I'm not saying you should solo, but you definitely have that option if desired. Rings are flexible.
Check this page to see all augment possibilities and what stones to use.
YouTube Video Placeholder