There's no reason at all why you shouldn't stick to Windows XP if you prefer it - that's a judgement only you can make. Eventually of course you'll begin to find that some new software won't run in XP, and in due course (but not for another five years) Microsoft will stop issuing security updates for it, so you'll be at increased risk from a security point of view.
According to Microsoft's published road-map there'll be no more OEM system builders licences for XP after the end of this month.
Maybe you'll decide to jump straight to one of the Windows 7 releases if you see continued positive feedback to it when it's launched.
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