Hard decision. I am facing a similar situation. Do I need more power? Probably not, do I need better handling? It could be nice, do I need a new bike for $7000? I simply don't know. I really do not think I would really have that much more "FUN" (this is why I ride), but I am the kind of guy that LOVES the best equipt (cars, mountain bikes, road bikes, surfboards, etc.....) so everytime I show up and all of my buddies have 05 CRF's, KTM's, and YZ's, yes I get a little jealous, but at the end of the day I continue to be amazed that I hang just fine with a bike I bought for under $1500 and is 9 years old and they are not having anymore "fun" than I am. But I continue to have this thing in the back of my head that I would love the coolest equiptment.
Argh?!?!?