of course stalker cloak, however with one caveat. your sensor gun is teh only thing you can fire without uncloaking. and an upgrade or a change in some way to the sensor darts that instead of them being a finite time frame they become a physical object that must be hunted and destroyed, unless attached to a person of vehicle of course then the time frame reasserts itself as sort of a "time till the enemy discovers they are bugged" This will allow for a better spy option, this is my selfish wish because it is how I had most fun in beta as a infiltrator.
The current timered cloak is already extremely powerful if you learn to use it. The real problem is that based on graphics setting some enemies see you perfectly well the whole time you are cloaked.
