Body only prices (from amazon)
D80 £500
D200 £790
D300 £980
At the time of purchasing my original D80, I considered the D200. But couldn't justify the extra size, weight and obviously, price for what (to me) wasn't a big enough step up.
The D300 seems to have taken things forward and maybe the size, weight, cost are MOre acceptable.
I'm pretty certain I'll go D80+18-200vr and a 50 prime though.