I had been using the basic Park one for several yeas, but after I let my wife use it - she didn't really pay attention when I showed her the proper way to inflate tires - the seals on the pump head became trashed. It still works, but not great.

I recently bought a Silca pump off Bonktown for $50. It's awesome. The pump head just slides on and off - there is no lever to fuss with. And it is supposedly completely rebuildable.