Upload & Sell: Off
just goes to show, as long as the equipment meets a minimum standard, it's all about the photographer. great shots.
if you're shooting mainly outdoors, I would consider the 70-300mm vr, used (going for around $350). Sure, it's not f/2.8, but unless you absolutely need the bokeh (and given that you were shooting f/4 before, it's not that much less), it combines fast AF, vr, and reach when needed. Optically, from 70-200, it's as sharp as you're going to get in that range, and out to 300 is not that shabby.
as for the body, you're definitely on the right track with the D300s. unless the D90 is significantly cheaper (e.g. with the savings, you can get the 80-200 f/2.8 2 ring), you really can't go wrong.
i also had a D70s, and it was starting to lose its legs. i'd start getting CHA errors more frequently, and every now and then, a raw would be half-written to the card. i had just over 10k clicks on it too. i was fortunate enough to make the jump to the D600 (by selling my beloved 17-55/2.8 dx and 85/1.8) + 24-85vr and the 70-300vr.
good luck shooting!