IMO, if your current system does what you need it to do then I see little reason to upgrade. Now, if you're a hardcore gamer, do sizable and complex rendering, CAD, or similar intensive work then sure I 'get it' and recommend that you go for it...
Further, if there's no immediate need then wait and see what the Ivy Bridge does and compare prices, but from what I know the prices 'should' remain on par to the current Sandy Bridge. Don't get me wrong, I don't dislike AMD but they really messed-up and oddly for me to say even just for the money to performance the Intel is the better upgrade path. Normally, I would be saying AMD $ to Performance.
Once IB comes out give it at least 2+ months for early adopters to get the bugs worked out...