That has to be in the 7 to 9 pound range. Not something I'd want to be lugging class to class, unless my name was Hercules.
I was reading of ZDNet the other day that if you buy a system with Vista, you can get a free upgrade to Windows 7 when it comes out. Don't know how that would work but its an option if you want to buy now.
When do you need the laptop for though? If it's not until the fall, I'd wait until then and get great "back to school" discounts on a laptop.