17" should not be a problem. Go to the Dunlop section at Sasco and select GT Tires. Avon and Hoosier 17" are available too depending on your diameter and width needs. Just ask Roger Kraus to help you with the size needs.
If you want to go with DOT track tires go to The Tire Rack in the DOT Competition section.
http://www.tirerack.com/tires/types/comp.jsp
Most of these tires are great if you can stop short of a full slick. Prices and size options are pretty good too. I have driven on the Pirelli Corsas, Yokohama Advan A048, and Hoosier R6 and have heard great things about the BF Goodrich G-Force R1. The Michelin Pilot Sport Cups are supposed to be great too although I hear they may not last as long when hot. You will have a ton of 17" options with many of these tires. I would say that the Hoosier R6s may be your best bet for track use. Many size options in 17", pretty close to a full slick, and very reliable quality. Lately this has been my primary track tire and I have been very satisfied.