i was looking at a Jensen touchscreen on ebay for $500. I did some digging and found some reviews, about 2 out of 15 were positive. I looked a little more and found a Clarion VRX765VD for about $580 shipped. I got it from this guy:
http://cgi.ebay.com/CLARION-VRX765VD-IN-DASH-DVD-AM-FM-7-TOUCH-SCREEN-NEW_W0QQitemZ300078257728QQihZ020QQcategoryZ94840QQrdZ1QQcmdZViewItem
I drive about 1500 miles a week, and i've pretty much had a dvd in watching it every day for the past 6 months or so, anywhere from 3 to 13 hours a day. I've never had any problems whatsoever out of it. I'd recommend it to anyone, it's bulletproof. And for $80 more than the Jensen, i'd say go with the Clarion. I've had Alpine forever, but it was for my daily and i liked $580 alot more than $1,000. Also, there's no brain you have to put under your seat with the Clarion, it all goes in the dash, in a single DIN hole. Freakin awesome.