The only things that irritate me about my current D70/lenses are:
Water resistance.
Size.
Lens speed.
Chimpability of the 1.8" screen.
Sometimes noise, but really I like the grainyness.
What does drag is the speed of post processing in aperture on my stock mini. As such a faster computer, a water-resistant body and a couple of lenses, and something small would be the order of the day. Compacts are pants for me because of the MASSIVE DOF as a result of the small sensor, more so than the noise.
I guess a D300, some fast primes and a 70-200 f/2.8 would be nice. Maybe a small E-410 olympus and 25mm pancake would be small enough. I'd also add a decent flash, probably the SB-600 to the nikon kit, a solid, light tripod, filters and a big printer!
Oh, yeah, and a studio...