Sun 17-Mar-13 03:02 PM | edited Sun 17-Mar-13 03:06 PM by SmokinJoe
I have a D200 and D3200. Like you, I prefer the buttons on the older model, versus the menus on the newer model.
If you look at Ken Rockwell's site, he gushes over the difference in D300 having the ADR feature... it is somewhat of a compression which will reduce washouts on the bright end, and saves the shadows a bit on the dark end. This feature has value, how much value is each person's decision. The D300, D3200, D5100, and D3000 have it, the D200 doesn't. To me that is the biggest difference between the D200 and D300. Is it worth $200 (price difference between used D200 and D300)? That's up to you. If you've never enabled it on your D5100, you probably won't miss it.
I use the D200 more than the D3200, and I get better shots with it because of the "2 button reset". With the D3200 I always seem leave it in some screwed up mode in the menus. I expect if you get a D200 or D300 it will become your primary, in which case you probably want the D300.