Paintball HPA/N2 Tank Questions...?

Well fist off, the higher the pressure, the more shots you can get off of one tank because there is more air stored (or whatever you have in the tank). And switching tanks to different guns wont affect the pressure or performance of a tank, only the gun will change the pressure output depending on where the velocity setting is. And the best tanks in my experience would have to be pure energy, or guerrilla. Although i am a 98 custom fan i must say, nice choice of a gun.