I have a GRX560 by SONY. Has a 16" screen. Its huge!!
Has all the power you'll ever need. Has a 30gig hard drive with 1.7 for speed. It also has a neat little feature for your camera and video cam. It has a port where you slide in the memory stick out of your camera, straight into your computer for fast down loads of pictures and videos. I'm sure you'll get a lot of input on this subject. Everyone will have thier favorite, but this is mine!!
Good luck on your search!!!