sideshow_bob has the answer. The Zipp 900 disc (you have to buy used, or raise your budget) will allow you to switch between road and track configurations, unless you're talking about running a flip-flop hub with a BMX cog for road events. In that case I would tell you to search for a set of the Reynolds SVD66 track clinchers. They're excellent wheels, light and very, very fast. Also durable, and because they use the same rim as the SDV66 road wheel, you can run brakes, no problem.
New, light and aero for under $1500 the set will be a significant limitation. You can also look at companies such as Williams Wheels, to see what they have.