Found Say Heuque by Googling "Tour guides in Argentina".
We had been working simultaneously with 3 different travel agencies, trying to come up with an itinerary. Say Hueque clearly knew the most about Argentina and about what was feasible and not feasible. I had some suggestions that were too aggressive time-wise and travel-wise, and Say Heuque let me know so! We were able to go back and forth many times tweaking the itinerary (with Say Heuque's suggestions) until we had it just right. We never felt bad suggesting yet another change, and Say Heuque was efficient and timely in responding back and effecting the change.
The tour guides were all very nice, eager to share their knowledge of the country, and very accommodating. The information they provided us with was very comprehensive. Transfers were all timely and directions as to park fees, meeting times, etc., were right on the money. Restaurant and leisure activity recommendations were very helpful. Prices were reasonable.
The Bel Air, in Buenos Aires. It was very comfortable and centrally located.
Favorite excursion - Perito Moreno glacier - mini trekking across the glacier.
Patricia and Rita? (guide to Colonia); both were super nice and super smart.
We weren't that happy with the Nibepo Aike Estancia. Though the area was beautiful, it was quite a long (and VERY bumpy) trip to see some sheep, walk around, and have lunch. We felt we kind of wasted a day doing that.