Water pump?

[boosted k20]

anyone know a site or store that sells new water pumps for integra's for a fair price.
and should i go with a stock water pump that acura makes or go with something like a GMB pump.

also do u really need to replace the timing belt tensioner when u change your timing belt? my motor has 85K miles on it and im gonna be changing the belt and pump when i do my head work.