I figured out what lens I was going to get to cover the telephoto range. LensRentals.com sells used lenses after they've been rented out for 20 weeks or so. I bought a used copy of Sony's constant f2.8 aperture 70-200 zoom from them, which retails for $1800, for much less than that. I am so happy with this lens! I used it on a tripod to shoot a wedding ceremony, and with the in-body image stabilization on my camera I am also able to hand-hold it for walk-around shots like the one above.
The only problem is that now I want to upgrade all of my lenses to glass this nice. No one ever said photography was a cheap hobby.