@WRO and i have been on the same side of this discussion like 3 times in the last year. Everything he has said i would echo. The information below is largely to clear up much of the discussion and provide information. Im not suggesting the OP purchase an All-Age dog.
Some important things to note.
-GSP's as a whole are no more or less high strung than setters. If your GSPs were wild, chances are high it's the training/trainer not the dog.
-Unfortunately there are not a lot of S-tier setters out there anymore. What i mean by this is that there are not a lot of successful setters competing and winning at the All-Age Field Trial Circut. This is the breeding stock that all real english setter breeders pull from. Fortunately there seem to be a lot of dogs competing in Shooting Dog stakes. The "best-dogs" are competing in the All-Age, the second best are in Shooting Dog, then Amatures, then on down the line to walking trials etc. This is not to say you want or need an All-Age dog. Its just to say those dogs are competing at the highest level.
Those dogs are as follows.
Woodville's Yukon Cornelius, Snyder's Fireside Ed, Erin's Wild Atlantic Way, Valor's Lace And Grace, Woodville's Long Hard Ride, Battle Born Bette.
-As you stray away from actively field trialing dog breeders, the risks you get of having a dog that is less than steller go exponentially up.
-Currently, the best breeding stock for hunting of ALL Setters is amongst those breeding and trialling English Setters. Everything else is a vain side show. Thats totally ok by the way. Every breeder is entitled to breed dogs however they want. I throw no shade at them. The fact is, no Ryman, Gordon, Llewellin is going to be competetive at the 2026 Grand National Grouse and Woodcock Invitational, Mortlach, Quail Invitational or any other competitive American Field trial. Vanity is fine. I love pretty Gordons as much as the next guy and love the storied history of Llewellins, but theyre not the end all be all of hunting xyz species in xyz type of cover.
-All of that being said, here is the catch. If you can find a breeder who lives really close by and trains/breeds his dogs to do exactly what you want to do, that can be a really great option. The best dogs in the world are very adaptable. its what makes them competitive on a national scale. If you dont need adaptability, the guy down the street breeding Gordons/Rymans/etc to hunt california quail in his back yard is probably a really great deal. Plus you can get a nice little training/hunting combo with them
NONE of this is to say you cant find INCREDIBLE setters for your needs. Its just to say the breeding stock is not what it should be. We're in a bit of slow decade of English Setters compared to years past. Id still point you towards a setter and any of the breeders mentioned are worth a look.
If you decide to get a dog not from breeders mentioned above, the biggest negative things to look out for are the buzz words:
-Close working
-Well mannered
-Gentlemens hunting dog
-traditional horzontal tail
-grouse dog
-off switch
Look for words like CH, RU CH, 2x Ntl CH, HOF CH.....they will be found in the Pedegree