I'm a Mac user traditionally, but I just found the greatest thing for this purpose. The Dell Mini 9 netbook. For anywhere from $250 to $400 depending on the configuration, it can dual boot Mac OSX and Windows (I just put Window 7) on it. Takes a bit of work (
http://www.mydellmini.com has everything you need to know to do this). I have a small 8 gig -partition- :) for windows, almost exclusively to run Castle Link and Tekin's hotwire. I still use the Mac OS mostly, and it runs amazingly well. Once you see one in action you'll say "I gotta have one" because it is so slick. Also, it's nice and small so taking it to the track is more convenient. This is just a pic I found on google that shows the size...