Well, this is rather fast, being 2.8ghz and tweaked. The main advantage is that 64 bit can take more ram, as i use of most 3gb even in XP.
I did see these as offering the best buys. What do you think:
http://www.computerlx.com/view_cart.aspx
http://www.pricewatch.com/gallery/computer_systems_with_os/phenom_555
http://www.pricewatch.com/computer_systems_with_os/
http://www.pricewatch.com/gallery/computer_systems_with_os/athlon_ii_x4_640
Get the best specs you can afford... slap your HD in, and go...
Tigerdirect.com has some good deals frequently on laptops and desktop PCs.
On BlackFriday/CyberMonday, I found a Gateway Core i5 with 4gb Ram [added an additional 8gb for an additional $28], 1Tb HD, Windows 7 Home Premium for $479.
I also got a 24” monitor for $119.
Look online and at store websites. Between now and the first of the year, you can probably find some good deals.