I know, I know - the ONLY thing to run in cross are tubulars, but for those of us who only have one clincher wheelset, does anyone have a good recommendation on tubes? I've been using Q-Tubes and I've had nothing but bad luck with them. I've flatted more this summer than I have the last two years and it always seems to be the valve stem area that's to blame. In fact, I've had a similar experience with these type of tubes on my road bike. I've sworn off them on the road and now I'd like to do the same for my cross bike. Any recommendations?? Anyone have a similar experience with Q-Tubes?