I have a D50, Nikon 18-70 (D70 kit lens), a screw-drive 50mm f/1.4D (on loan from my dad) and the little SB-400 flash. It's been great but I want video, better high-ISO performance and better behavior under CFL and LED light bulbs (D50 is miserable in this regard, even with custom white balance).
I don't have a need for the extra pro-level features that come on the D7000 and would like to spend around $800± at the most -- so I will probably give the 50 back to dad and start over with a new "G" 50mm with a built-in focus motor.
What would you do? Get a more basic body (refurb'd D3100 + 18-55 or refurb'd D5100 body are around $400 at Adorama) and a new 50mm f/1.4G or a nicer body like the D3200 and the basic 50mm f/1.8G?
I really like some of the new features on the D3200 (mic jack, Android remote control, double the resolution of my D50) but am hesitant to spend the extra money on the body versus a nicer lens I will keep forever. My decision would be a lot easier if I could get a D3200 without the plastic kit lens I don't need for $100 less.
My eventual plan is to get the next entry-level full-frame camera that slots in under the D600 since I do a lot of night photography, star trails, etc. (I want it for the big ol' sensor and no crop factor, not for all the additional pro-level stuff like external flash control and etc.)
Also, if I move to the 50mm 1.8G instead of getting the 1.4G, will I be disappointed down the road? I am mainly asking about build quality and longevity over the wider aperture.