At the moment, the D90 goes for around 400-600 depending on the condition and actuations.
And the D300 goes for 450-700.
So, I don't see your camera as a good enough trade without cash on your side as well.
Hatch Nation Member: #147
R.I.P - FELLOW FF MEMBER, IZZY, BLK2k3GTS, will always be remembered. We will compete on a different course again one day.