Since you already have two D300S bodies, you can afford to wait to see what is coming (D800 vs D400 announcement). Given the body differences between the D300 and D7000 lines, I would wait to see what is announced. If it is the D400, go with that; if the D800, get the D7000.
Rockwell can be a fun read, but take what he says with a grain of salt as his view of the world can be a little different from most folks.
---------+---------+---------+---------+ Joseph K Seattle, WA, USA