V2 management is where you can control only the pressure, and I think just both corners in front at same time abd back corners at same time.
3P management is the system after V2, that controls pressure only again, but I think its a more advanced version where you can control pressure for each individual corner and more.
3H is the latest system that controls pressure and has height sensors, which is the one I will be getting this Spring.
Then have the struts, where you can go SLAM series or Performance series.
SLAM series is basically as it sounds, whilst retaining OEM comfort. 9 levels of damping adjustment, simple way to be able to slam the car.
Performance series is again as it sounds. Offers more damping tunability so can have it soft for general cruising or stiff for track days etc., uses monotune shock internals which are lighter and more sensitive. I think you can get an extra degree of neg camber as well on this kit compared to the SLAM series.
Just need to drain the tank once a month to stop a build up of water which isn't a hard task at all and takes minutes to do.
I would advise going on Airlift Performance site to read in greater detail on each management system and strut kits.
Price wise, depends if you buy new or used. Prices vary greatly.
As an inclination, i'm going 3H Management with performance struts with half sunken boot build for 3.8k. Thats about as expensive as you can get unless you go for a crazy boot build.