Alright, I'm buying a receiver, 4 speakers, a sub, and an amp for my new truck. It's a 2007 Colorado, so it isn't very big. I'm trying to keep it under 700, which I did. Anything I should change out, or reconsider? >>>>>Dual XDM7610 CD Receiver * Price Break - Save $10: Was $159.99 Vehicle: 2007 Chevrolet Colorado Pickup Extended Cab without Door Tweeters; without OnStar (change) >>>>>Polk Audio MM 2104 10" 4-ohm Component Subwoofer Yes $119.99 >>>>>Polk Audio db 651s 6-1/2" Shallow 2-way Speakers Vehicle: 2007 Chevrolet Colorado Pickup Extended Cab without Door Tweeters; without OnStar (change) Speaker Location: Rear Door Yes $99.99 >>>>>Profile HA700M 200W x 1 Car Amp Yes $99.99 >>>>>Polk Audio db 650 6-1/2" 2-way Speakers * Price Break - Save $20: Was $99.99 Speaker Location: Front Door Yes $79.99 >>>>>Q-Logic QLH-10S65 Single 10" Hatchback Subwoofer Box Yes $49.99 >>>>>EFX Amplifier Wiring Kit 8-gauge w/Patch Cord Yes $39.99 All the speaker mounts and such are included of course, so don't tell me to buy those.