Where will you be hunting? What species of upland birds? I've owned, bred and trained pointers, GSPs, wirehairs, drathaars, labs, chessies, and judged the rest. NAVHDA, member of their international board, run their training clinics, won the National Amateur Grouse Championship and the International Woodcock Championship with a pointer (Wynot Ace), that I bred and trained myself. What are your goals in terms of performance, temperament, house dog, kennel dog? How much do you think you will enjoy training? How many times per week will you spend 15 minutes training your dog, what grounds do you have to train on? Do you want steady to wing and shot? force trained to retrieve? You okay with sloppy work, or do you want the epitome of the sport? I've had GSPs that would break a window to get out to retrieve a goose. I've had drathaar I couldn't get out of the salt water in Maine in January if he saw birds on the water. I've had a bunch of crap dogs that I sold down the road to someone that would be happy with them. What I'm trying to say is sit down with a legal pad and answer those questions, then come back to the thread with what you have written down.
Birdmanmike has a lot of good things to say, especially about those German dogs being stone heads.
If you are hunting open desert you are going to need excellent confirmation, including feet, and stamina, since a dog worth turning loose in that country will need to cover a lot of rough ground. Most versatiles won't have what it takes, at least for me. . . but then I prefer a dog that fills the country and runs to the birds, not "windshield wiping" 50 yards ahead of me.