I'd have to disagree and say to stay away from Kenwood amps. Also, Rockford amps are very high-priced. You can do a lot better for the money.
If he's looking for a good component set for up front, I'd recommend Image Dynamics, or maybe some Digital Designs 6.5s paired with some Vifa tweets.
As for decks... it's tough to beat Alpine for "flash in the dash"

I personally use Panasonic at the moment. My next deck will probably either be a Panasonic or Alpine.
I use Polk in my HT, but don't think I would in my car. I've never been impressed with any of their car equipment. Too many other companies that make superior products for the car. Image Dynamics, Digital Designs, JL, Treo, Elemental Designs, Kicker, Resonant Engineering...