Yeah, for what you've stated I'd say a used D90 and used push pull 80-200 would serve you best. The ONLY con to the push pull 80-200 is its a little slow to focus (though about the same speed as the tamron) but that really only matters if you're doing live sports. As an outdoor portrait lens, it's an absurdly good value at the $400-$500 range.
D90s are just as good as D7000s if you don't plan on shooting low light and need the better high ISO performance.
Then I'd spend the leftover on the tamron 60mm f/2 which is easily my favorite dx portrait lens.