Topeak RaceRocket HP. Had a Topeak Road Morph G that I loved, but was way too bulky. The RaceRocket HP was bought on the recommendation of someone here on BikeForums. Loved that it is small, could be put away in a big enough saddle pack or jersey pocket and also have a water bottle cage side mount.

I've had it seven months or so, not used it in that time, but about three weeks ago decided to just test it at home. Was able to get to 110 psi on a 23mm tire with absolutely no issues.

It does rattle at the piston barrel/pump body juncture when riding with the pump mounted behind the water bottle cage, but I wrapped a little piece of electrical tape there, and that solved that problem.

Great little can-do pump!

http://www.topeak.com/products/Pumps/racerocket_hp_bk