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#11
I don't want to sound snobbish, but I don't think $800 buys you a "high end" PC. I guess just a real high end processor would cost you more than that.
I suppose a sensible statement is that if you want to have a responsive system you have to have something more than the minimum requirements published by Microsoft. This means that if you buy a netbook, then you should not expect a fast system, although others may disagree - personally I've never looked at netbooks.
That said, a decent PC typically costs less than a comparable Mac, so using Windows 7 is by no means exclusive.