Having trouble deciding. Need some advice.

[gotb00st]

I'm fairly new to these forums, I have been lurking for the past month trying to get some ideas together. I'm working on getting a build together for my GMC Envoy and I want to step it up a bit from my last system. Right now I am currently looking at possibly 2x FI sp4 15s but i'm afraid with the space I am willing to sacrifice I wont be able to build and efficient box for them. I want to keep the box below the windows so my maximum dimensions would be 17H x 45W x 22D. If needed I may be able to squeeze 29 depth. I building this system for daily driving, I listen to allot of dubstep, rap/hip-hop, and some heavy rock. I want to be able to hit those lows in dubstep while maintaining the tight bass in rock songs. I was looking at possibly downsizing to 1x 15 or 2x 12 is i could still get some nice bass out of them. Im looking for same bass equivelent to 2x JL 13w7s tuned at 33hz in a hatchback for my envoy. This is my first suv build.