Re: What AMP SHOULD I GET???
So your starting with a clean slate... and can do whatever you want..
There are some great threads on how to pull/route power to your amp.
Where do you plan to mount the AMP? Under the DS floorboard or in the trunk area? Make sure to impedance match the amp to the speakers.
If you are going to mount the subs behind the seat, then you may be limited to 6.5" "fee air" subs - so you might not need a dedicated subwoofer amp, perhaps a just four channel amp with X-over/bass boost to power the subs?
I think I saw a thread where a member chopped up the area behind the seats and fabricated in a pair of 8" enclosed subs... if you do that - then you might need a dedicated 2 channel subwoofer amp properly power them.
Money, skill and mounting locations are your only limitations....