The Lezyne CNC Floor Drive. I have a cheaper model, the Classic, which is fine so far.
I also have the JoeBlow Ace dual tube pump which has worked fine so far and moves more air per stroke in high volume mode than the Lezyne.
Silca and Zefal also make some good pumps at least by reputation.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/