Thanks for the advice Tejano. Coincidentally the tire I got a flat with (after only two or three weeks of riding) was a Continental Sprinter. It came with the wheel and seemed to be quite a bit used. Maybe I just had bad luck. Not wanting to take on the task quite yet of repairing the tire I put an almost new Continental Competition on the wheel which I got for free. Hopefully I'll have better luck with it otherwise I'll try something like the Pave.