+1 bareknuckle. The bummer there is that since it's the obvious answer, they're getting to be pretty common.

If you want something fun and affordable in aluminum, check out some of the higher end frames from the major manufacturers. Fuji and Raleigh both make "pro" models of their track bikes; I'm sure others do as well. I've test ridden a few but don't own any, so you'll have to look to someone else for specific details.