New computer build

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http://ubuntuforums.org – Hi community. I'm looking for some input on building or buying a computer. I'm leaning toward a build for price, but let's put the cart before the horse. I HAVE to put Windows on it, at least one release bootable. The others I can vbox. Ubuntu will be the main OS I use. I don't do anything that requires a lot of beef, but I do want to build the most powerful computer I can. I occasionally will get on a gaming kick, but short of that it is general surfing, text editing, java, video etc. Here is the rest of the story. I am looking to stay in a $500 US budget. I already have plenty of (Hardware)