Mobility Enhance, Tracker, and whatever you want for armor (I personally go with armor enhance cause I have it at 3 and it basically makes you a tank when **** hits the fan and you can't assassinate the person) this with a suppressed feline will let you run forever, even while cloaked, getting behind the poor bastards and getting a quick kill. Just thought I'd share my favorite class.

Personally, I enjoy a lot of cloaked mobility. My main class is normally:

Stealth Enhance
Nano Recharge
Mobility Enhance or Aim Assist

I use Aim Assist III mostly because it allows me to move while ADS a bit quicker, so I can strafe shot people a little more effectively.

Nano Recharge is amazing because I don't have to stop for more than 2 seconds to recharge my energy. It allows me to basically keep moving at all times.

If I use the K-Volt, I like to use Weapon Pro because I blow through ammo and it takes a bit to kill someone, so the reloading speed is needed (for me).

On occasion I'll run with Retriever, but usually save for my sniping class. All said, I can't wait to get my modules back to max levels...

mine before reboot was:
nano recharge 3
stealth enhance 3
mobility enhance 3

scarab with holo sight, silencer and extended mag
m12 nova with silencer and extended mag

and damn it worked, i was a beast with this setup!
now i'm working on it to get all the good stuff back.

I go with:

Energy Transfer
Stealth Enhance
Mobility Enhance

Rocking the scar with reflex sight, silencer and extended mag.
The hammer as my secondary.

Since switching to this class I have brought up my K/D by over a half a point, and have not had a negative game even when my team is getting pwnd.