There is one down side about BootCamp, If you wont to use certain drivers you need to have Windows XP Service Pack 2 or later. And Vista.
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You should definitely have Service Pack 3. If you're saying the downside to Bootcamp is that it installs Windows then I can't help you out there.
I strongly recommend installing Windows. You can upgrade the graphics drivers to ones much more current than those Apple provides and potentially overlcock.
 There is one down side about BootCamp, If you wont to use certain drivers you need to have Windows XP Service Pack 2 or later. And Vista.