Re: Comp Build
I'd say go for an 64. By the time you build it the Winnies will be much cheaper so you may be able to afford a 3000+. There are hundreds of motherboards to choose from as well.
You don't want the Xeon, that's for servers, a Celeron is a waste of money, and an XP leaves you no upgrade route so if you get enough money to buy a 64 3000+ after you have bought an XP you will have to buy a new motherboard.
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