I use a Specialized Air-Tool Comp. It features an aluminum barrel, steel base, a nice gauge, and a head that adapts to schrader or presta automatically. $43 from Specialized.com or your LBS. The sport is a little cheaper at the expense of a plastic barrel..
http://www.specialized.com/bc/SBCEqP...jsp?spid=25945
Mine serves me well. An added bonus is that the barrel unscrews easily. Makes greasing the O-ring periodically a cinch.