Spyder E-99, smart parts All american 16", shocktech superfly delrin bolt, Egg II, ACI bulldog III 68/4500
lightweight, consistant, relatively cheap
I cant really think of any
I bought this from my local paintball store for about $200, and so far I have been very happy with it. It runs more consistantly than my old CO2 tank, and performs better in the cold. Ive been hearing that ACI's 3000 psi tanks are crap, but te 4500 seems to work well for me.
Overall, I'd reommend this tank to anyone who is upgrading from co2