I use aa Blackburn. I think its called the "Mountain Air" or something like that. The top of the pump can be changed from Schraeder to Presta by unscrewing the top cap and reversing a peice. Fairly easy to do, but not like the "smart" heads that come on some pumps. It's worked good strapped to a bike during races/epics/crashes/drops for two full season. It's been used on winter rides on snowmobile trails also and I didn't have a probolem with the plastic or anything. It was only $15 (At the LBS)or something. Less cheap than most of the other ones you can
find. I use a Topeak brand pump as a frame pump on my road bike and haven't like it as much as the little Blackburn in regards to the quality.
-Moab