Really think about how you hunt and pick a breed, or breeder if you are certain of a GSP, that will fit your style of hunting. You see supercharged GSPs and English pointers tearing it up in field trials but recognize that is a SPORT and those dogs are bred for that SPORT. I you are a weekend hunter, hunt small parcels or cattail sloughs then you probably don't want the type of dog that will be winning trials. I have a GSP that works at moderate range, which is fine in the midwest, but she tends to be so driven that she will sometimes be working faster than I can keep up and wild pheasants are pretty sneaky. Often, they won't give you a picture perfect point/flush/shoot. Most of the time, the dog is tracking a running bird and trying to cut it off at the pass and the birds will sometimes just flush wild. I honestly can't imagine a big running bird dog doing very well where I hunt in Iowa.
Some people breed crazy high drive GSPs for trials and I would wager that isn't what you will want or need even if you do hunt some more open areas than I do. Find a breeder that is a hunter who hunts the same kinds of places you will. Craig Koshyk has written some good articles on picking a breed that is right for your life. I would highly recommend you check out his articles and listen to 'the Hunting dog confidential'.
The last thing I will say, and I did not realize this until we got our GSP, is that they shed LIKE CRAZY!! You'd think that with short hair it wouldn't be bad but the short hair makes it worse. They shake their body and you will see a cloud of tiny hair float off them like you just shook out a dusty rug. Hair will be EVERYWHERE...the hair is so tiny and stiff that it will literally poke into and through all the fabric in your house and will not simply brush off like long hair does. It pokes into and weaves through the fibers and never comes out. My suggestion is to buy furniture and all your clothes to be the same color as the dog........honestly, after have two GSPs, our next dog will be a long or wired haired dog just for that reason. I'm looking into German Longhaired Pointer's, Large munsterlanders, Picardy Spaniels, and Griffons.