I know Nikon rates their shutters for averaged total actuations, and their lower-priced models aren't nearly as high as the higher-end ones. Has this ever really been an issue? I know there are some D50s still kickin' out there, so it seems like the shutter can last a good long while. I'm just curious because I've never actually heard of someone's shutter wearing out.
And, if mine does anytime in the nearish future, I'd have to say the D80 would be my preferred upgrade. I like the sturdier build (by the way, is the D80 build on par with the D90?). As for the D90, I'm going to wait on a video and live-view equipped camera until both features are further refined from what we've got.
Nikon D40 + kit lens
Nikkor 50mm f/1.8 D AF(...or not)