Interested in getting 2 BTL 15's, got a ?

[Loud01Blazer 0]

Ok i'm wanting to get 2 BTL 15's, i've got an MA Audio HK4000d for power(2000 watts to each 15) it will be mostly for daily driving, but i do go to 3 or 4 comps a month.. What options should/i need to get to get the best performance from these subs? thanks.