Not really in any huge hurry to swap as I really like the D90 but do prefer the 300 since it meters through the older glass. My 90 has ~2K clicks on it and looks as new. I've mounted the kit lens a couple of times and will also toss in a Sandisk Extreme III 4gb SD card. I have a Kirk L that can be worked in the deal... especially if you have a L bracket for the 300. I do have a Phottix Cleon N6 remote on the way for it that I'll trade even for the N8 that works on the 300.
Note: Willing to throw in some $$ if needed for a low actuation 300.