Thanks for all the suggestions! j/k
I got a Think Tank Urban Disguise 30 at a local shop yesterday and I love it. It perfectly fits my D90, Sigma 10-20mm, 55-200mm VR and 35mm DX with one of the three attached. Plus the strap is long enough that I can strap it across my chest and it hangs right at my hip where I wanted it.
Ive never had a camera bag before and it's so cool to be able to have a way to carry more than one lens around and change lenses! The last time I tried to carry around two lenses I had to stuff one in my shorts pocket and set it down in the dirt to swap