my sis is coming home from the states this month, and she bought me these stuff for my car, please tell me what parts do i need and most importantly the amp that could power all these. as much as possible i want it cheap but has quality. these are the stuff i got...

SUB: Polk 12" 365-Watt Subwoofer or Pioneer 12 inch 500w
Brand/Model: PLK GXR124 Car Subwoofers


HU: Pioneer XM™ Radio-Ready CD Player
Brand/Model: PIO DEHP3500


MIDRANGE: Pioneer 6.5in. 2-Way Car Speaker
Brand/Model: PIO TSG1647

AMPS:?
X-OVER:?
TWEETERS:?

im new to this car audio thing, i would appreciate your comments. thanks guys.

cheers, spazz