there are quite a few out there that fit those needs. not sure about pluging it in to your computer. they are all self powered.
Garmin, TomTom and others should be able to get one for around $150

Last edited by 50adrod; 02/08/2009 4:28 AM.
1950 custom streetrod build
http://67-72chevytrucks.com/vboard/showthread.php?t=296770

71 corvette conv, 525 hp big block