I also would suggest considering a pump marker with a hopper and a small co2 tank.
Running a small sized hopper and a nice small co2 tank allows you to play alot more freely.. you dont need to walk onto the field thinking about the 10 balls in your stock class tube and the 30 balls worth of shots you have in your 12 gram cartridge.
It seems alot of people tend to end up running a co2 tank anyways for economy purposes. I had a vertical feed phantom with a bottomline and ran a small co2 tank and it was a great great gun. Its just nice to not have to carry 10 round tubes and buy 12's at big 5.
So consider that.