This is what I came up with, 6 6.5's will probably not happen with that budget lol
JVC Deck: http://www.sonicelectronix.com/item_33388_JVC-KD-R320.html
DBlink Wiring: (cheap, but should be alright) http://www.amazon.com/PK4Z-Gauge-Power-Amplifier-Installation/dp/B000Q6DLTK
Audiopipe Amp: http://www.vminnovations.com/Product_4493/Audiopipe-APSM-1300-2000W-Mono-Mini-Amplifier.html
Pioneer Mids/Highs: http://www.vminnovations.com/Product_8336/Pioneer-6-5-350W-2-Way-Component-Speakers.html
Infinity Subs: (1 of each for total of 3) http://www.vminnovations.com/Product_9405/Infinity-REF1060W-10-Inch-1100W-Subwoofer.html
http://www.vminnovations.com/Product_9404/Infinity-REF1060W-10-Inch-2200W-Subwoofers-Pair-.html
Total: 452.49
Vminnovations coupon for amp, speakers, and subs: -22
New total: $430.49
I'm sure you can go cheaper on the subs, saw some powerbass for 40 a piece, but I chose those as I thought they would be semi decent compared to the rest.