You know, I don't know much about Alpine or Pioneer other than the fact that they make great home audio equipment. I was checking out the JVCs just because they look better than the others. To me, it's not only about Performance, but style. Check out the JVC KD-LH300.
Motorized face plate with tilt. Plays CDs/MP3s/WMA/ files. 50 watts power x 4 channels. PICT so you can download images to the faceplate. Hella lot of colors. 3D Graphics are awesome, but not the best. Dedicated sub output, gold plated rca line output terminals. And its Sirius compatible.
Check it out here:http://www.jvc.com/product.jsp?modelId=MODL027149&pathId=54&page=2
$249.00 at Best Buy, but I spotted one for $211 and bought it on the spot. Haven't installed, but just looking at it makes me drool.