Alright so...instead of sticking with two 15's, I'm now thinking four 12's.
Four RE RE 12's is more cone area than two 15's and cheaper (I was going to do two IA 187 15's, for like $250, I can get four RE RE 12's for $170)
What do you guys think? I'm thinking ~8.5 ft^3 tuned to 35.