Body or lens ?
I was in pretty much the same spot last year. D40x, 18-105VR, 55-200VR and a 35mm f/1.8. Earlier this I passed on an new body for a Tokina 12-24 f/4.0 Di-II, and Tamron 70-300VC lenses. That was a great exeriance. Last month I got the new body, the Nikon D5100, it isn't as exciting as the two lenses so far.
I'd vote lenses.