I want tight, punchy bass. I am thinking about upgrading the door speakers to take advantage of my new HU. If I got the crystal's, would I be able to crank my HU amp?

For the next step, I was considering getting 1 10" infinity kappa. What kind of box and what amp would match up to this driver. How do you audiophiles think this would be for a complete system:

HU - Pioneer Premier p730 (already in) - $260
Doors - 2 pairs crystal 5x7s - $200 (s&h)
sub - infinity kappa 10" ? - $200 (I think)
box - ?
amp - ? (i'd wanna drive my crystals with the amp right?)

Basically I wanna keep it under a grand total...

2000 CSVT #1172 of 2150
Toreador Red...Birthday -> 1/4/2000
*Indiglo Gauges
*Drop in K&N
*Sylvania SilverStar Highs in Lows
*Fog light Fix
*Pioneer Premier P730
*Sound by Audiobahn
*White HVAC Panel
*Security via Ungo MS2007
*Elky Mesh Mod