Becky,
I'd agree that you'd be better off with the HP laptop from Best Buy. To clarify, it does have a DVD burner.
Computer RAM / memory is not quite the same as upgrading your camera memory. The Best Buy HP laptop uses a special kind of memory called dual channel, which means if you have two chips of memory in your computer, it can access both of them at once, very quickly. I would agree that upgrading this laptop is a good idea, since it comes with only 2 chips of 256 MB (512 MB total). I'd recommend getting two 512 MB chips for a total of 1 GB, unless you're a big spender and want 2 x 1 GB = 2 GB. To get a good deal, go to dealram.com and look for the size and type you need, which in this case is PC2-5300 DDR2 SO-DIMMS (667MHz). Make sure to get two of the same chip so your computer can run in dual channel mode. Good brands include Corsair, Crucial, Micron, Kingston, PNY, and probably more. You could of course get your memory at CompUSA or some such place too, but you will pay extra for the convenience.
I hope that helps!