I ride mountain and use this one:
http://www.jensonusa.com/store/produ...orph+Pump.aspx
Has a "fold out foot" feature and gauge option. Easy to use. It's a bit long, but stashes easily in a Camelback. When someone in the group flats, they always want to borrow it. One guy borrowed it and broke the fold out foot. I emailed Topeak and the part (free) arrived withing a few days. Great customer service. And superb product.