I must vote for the continental grand prix 4000's. I've ridden them heavily since April (including in Ironman AZ) and have yet to get a flat. Of course now I prolly jinxed myself!!

But yeah, you will get a flat at one time or another. All I can say is practice ahead of time at home so you'll be more comfortable doing it on the road.. Perhaps that has already been said,if so- sorry, I didn't completely read all the replies.