We need some help...

My wife and I are both avid birders and are looking forward to our trip to Puerto Vallarta, 3/6/10 - 3/13/10 to do some serious birding.

We are planning to hire a guide or sign up with one of the companies that offer birding tours. In looking on the Internet there are several companies to choose from, leaving us wondering which one is the best.

Does anyone happen to know of a guide or a company in Puerto Vallarta for birding that you could recommend?

Any information/recommendation would be greatly appreciated.