I loved my 600 dollar setup.
Kenwood KDC-X491 direct connect for iPod. -169 at
crutchfield, but can be had much less at other online stores, but needed what came with the package.
Pioneer Premier 720c's comps for front-125 at most places, but can be had for 100 bucks depending.
Pioneer Premier 6x8's in rear doors.- 58 at onlinestereo.com
2 12" Pioneer Premier championship series subs. 65 each at onlinestereo.com
1 Autotek 1000rms 1-ohm stable sub amp.-150 at onlinestereo.com
Already had the highs amp, crossover and wiring from previous setup, so I would have been pushing 800 all set and done, but not too shabby.
Good luck!