Congrats on your new "toy". I´m not an D300 owner (have D700 and D90), but i´m almost in the same boat as i´m looking for a D300/300s to replace the my GF D70s. For me, the D7000 isn't such a big upgrade from the D90, though it's better. The build quality of the D300/300s it's a big step forward.
Nikonians!!! My best investment made after my camera!!!