I've had good luck with Gatorskins. You'll get a lot of flat free miles, without sacrificing too much performance. Most of the other tires I've used are heavy commuter tires, or ultra-thin race tires. Gatorskins are the best compromise and work well in the city. Note that I don't skid (anymore). After 25,000 miles riding fixed and SS, skidding seems silly. People who skid a lot may have other opinions about tires.