Dual? ick.
Nothing but Alpine or Eclipse HU's for me if I can help it.
also, I agree with Brad. Infinity speakers.
When choosing a HU, look at the manufacturer's background. What do they focus on?
Sony? TV's
Kenwood? Home Audio
Pioneer? Home Audio
Alpine? Car audio
Eclipse? Car audio.
My theory has yet to be proven wrong.
Oddly enough, I've had a Sony, Pioneer, Kenwood, and Alpine.
The Sony was a complete piece of shit. Xplod? I wish it would have...
Pioneer had some strange quirks. Buttons wouldn't work sometimes, then everything would be fine for weeks without problems...
Kenwood? You have to push on the face at a certain point for any of the buttons to work, or use the remote.
Alpine (9825 i think) I did have a problem, would not accept CD's when cold, and one day it would make the sound like it was trying to accept it, but just wouldn't. Opened it up and found out that one of the plastic slider pieces in the ejector mechanism snapped in half. BFD though, the thing was $100 out of box and came with a warrantee. Turns out that I was still in warrantee when it broke, and just didn't know it. Called it in 3 days after my cutoff and Circuit City "couldn't" do anything about it.
That was 5 months ago though, I'm still using it. I just removed the CD mechanism. Works flawlessly with XM.
I have no first or second hand experiences with Eclipse, but I've heard much good.