Doug offered up the best advice. Dell usually has the best deals, although on occasion, others do outshine them. The only brand I highly recommend you stay away from is Gateway. Other than that, it's really hard to get a "bad" laptop.
As far as your question about AMD vs. Intel, it should not matter to you at all. If you want to get down to it, technically, Intel has the market cornered, and IMO, pretty much always has. The New i5 and i7 processors are simply amazing. For you though, AMD will more than suit your needs. Also, don't get less than a 9-cell battery, because on a regular laptop, 6-cells aren't worth $#!t.
If you are interested, I have an employee plan through Dell, and also I am Dell certified tech for their Laptops, Desktops, Servers, Switches, and Printers, so I get some decent discounts. If you want me to throw you one together on the site, let me know, and I'll see what kind of prices I can get.