Which Set Up

[kdeezy]

I live in louisville ky and after attending carl casper auto show and here some of the systems there I would like to upgrade my current system. I have a 95 suburban and I like to keep the third row seat in it. I already own a ma audio hk802sx amp should i go with 2 15's (sugestion on brand) or 1 18" sub (solo x, maybe); I have a budget of $800-$1000 for the subs. aldo where can I find a 200 amp alt. the highest I've found so far is 160