If you're sneaking around you're already walking or crouching. 7 seconds per energy cell at best? Jesus. Cloaking: good to throw off enemies that are gunning at you but it's just way too expensive on power to be any use. I used fortify once or twice but it wasn't worth it. I instead buffed Hacking: Stealth so I can get closer to the target(s). Seriously useful, makes sneaking around a ton easier. Modifying turrets and robots is soooooo handy later on. Hacking: Capture, if you happen to like hacking. Often the bad guys carry them and especially the later boss battles.
Anti-Concussion eye aug (again, whatever it's called) is exceptionally handy later on.
Dermal Armor, after it's fully buffed you can withstand two grenades back-to-back. I'm almost done with the game (95%, yes I looked ) and there are some more augs that have definitely been beneficial:
