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My recommendation would be whatever holster you carry in normally with the gun you normally carry. The whole idea behind the combat shooting competitions originally was to let police/military shoot simulated scenarios with their duty gear.
If you don't normally carry, then ask some of the guys shooting in your comps what they're carrying.
Check out: http://www.ipscholster.com/ for some speed holster ideas
as well as : http://speedshooter.com/category_list.cfm?ID=HL for more racing holsters