I haven't really looked specifically into the 15" models as I went with a 17" model, but I do want to say that I've been extremly pleased with NEWEGG.COM. Scared the hell out of me to order from them, but after a ton of investigation I've found that a huge amount of people like them a lot. I've since ordered a lot of equipment from them and they clearly have the best prices and availability, and are a class act.
FWIW.
Ron