I've kicked this around also. I'm staying with DX for another year or two (or until I either get a large influx of disposable income, or the cost of a D600 drops a little more). For me, it comes down to this:
DX is better if: You like smaller, lighter, less expensive cameras and lenses. You need the 1.5 crop factor to extend your long tele lenses for sports or wildlife (probably because you can't afford the astronomically expensive pro long teles). You don't print a lot of poster-size prints. You can't afford a camera that starts at $2,000, and the lenses that go with it.
FX is better if: You shoot action in low light. You like wide angle photography. You like/need reduced depth of field. You prefer the bigger, brighter viewfinder of FX. You already have a lot of older film lenses that work great on FX, but give you weird/less useful focal lengths on DX.
For me, pretty much all of the above apply. So, I'll eventually get a D600 or whatever replaces it, and keep my D7000 or another DX body for my telephoto needs. I think for a lot of us, there is room in the camera cabinet for both.