I'd stay away from Alpine headunit's myself, unless he know's someone that works at BestBuy and can get him employee pricing on a 9853/9855. I hear the BestBuy employee price on a 9855 is 250 bucks. But even then I'd probably opt for something else LOL.
If he doesn't mind not having MP3 Playback or a detachable face I can get a new Eclipse CD8053 for a little over 300 bucks from a very reliable source.
Then there's always the Pioneer DEH-P860MP on ebay(cringe

) for about 300.
For amps, I'd have to say the MB Quart RA2400 from Crutchfield. 2 of them. They are 229 shipped, when you use a Crutchfield Coupon.
Run the first one to a set of passive components, then bridge the other one. They do 200 watts rms x 2 and 800 watts rms x 1 when bridged.
For subs, the TC Sounds TC2+ 10" DVC Subs are 99 bucks each at
www.oaudio.com
That leaves about 500 bux for front component speakers, raammat, wiring and miscelaneous stuff.
For speakers Marv has the adapter bracket for the gen4/4.5 camry so you can get a set from him. That should give you probably a 2.75" Mounting depth I'm guessing.
What kind of music does he like mostly? Does he want a very detailed set that will reveal everything, or does he want something more mellow and laidback?