My advice would be to stay with the Barton XP 2500+. That way you can take advantage of the FSB offered by the motherboard and also be able to run the memory is sync with the FSB of the processor, which usually nets you some additional performance.
Secondly, go over to
www.newegg.com and price those same components. Bet you will find them cheaper. I have found googlegear to always be higher priced.