Amp - JL, Phoenix Gold, Alpine

Get the mono amps.

What kind of subs do you want?

1 12"
2 10"
1 15"
2 12"

For the sake of guessing I'm going to 1 15"

Check out this one
http://adireaudio.com/mobile_audio/drivers/tempest.htm

This is a very highly rated sub. Very high quality, low distortion, etc. Another to check out would be a Mmats Procast.