The only augments you ever want are Willpower.
Depending on spec, you want your critical rating somewhere between 250-300, I believe. Stack power in your mods and enhancements after that. Surge should be around 300. Go with alacrity after that. I can't remember the exact "best-in-slot" numbers off the top of my head. Point being, all of these numbers are achievable by switing out mods and enhancements in your gear, which is why you don't need to worry about using augments for crit or surge.
im pvp so mods dont mean crap since expertise is needed