Arena is probably your best bet, at 45 a case with admission on tuesday night (tourney practice). While hivi is great if you don't mind the rather pricey paint/admission, it is cleaner, but I find the players on an average day of paintball do happen to cheat, while refs don't seem to do anything about it. Arena has generally great players, nice refs, and a great facility (with a full proshop inside).
"This whole 50 caliber thing is still YEARS away from having any sort of measurable impact on the sport." - Mike from ******