go for the 2 cvr setup. imo the cvr's have nice sq. i know the cvx sounds good but the cvr sq sounds almost just as good. also since there will be 2 subs it will get louder than the one sub.
id get the cVX its alot better then the cvr the cvx is an L7 but more SQ save money and go 2 cvx or get 2 12 cvx or 2 10 they would still h*ell pound dont necessary need 15 2 12's is just as good