Tritronics are great collars. We use them and love them. The big buttons are a plus as they are easy to just use instinctively. Might not seem like a big deal, but it makes it much easier to give timely correction. If it takes you 30 seconds to find the right button it is pretty much useless...
I've got a cabelas branded innotek that works pretty well too. THough the buttons are flat and harder to find without looking.
I'm a fan of pinch collars, they work well and they're cheep. You might try one before you spend a lot of money on a shock collar.
That's not really the answer to you question but I think you would be wise to save the money and spend it on beer.
Pinch Collars aren't really appropriate for off leash field training. They're essentially useless. We're not talking about leash training or basic commands like "sit". More advanced field work, retrieval, etc.
Is it standard to use one for that? I have a hard time believing shocking your dog is ever a good thing, but where I volunteer its 100% positive training. Personally I wouldn't use one on my dog if I wasn't willing to put it on, dial it up and try it myself, but I love my dogs.
I've put mine on. Stings like hell while it happens then done. No damage. My dogs rarely get shocked either. A few times a season, maybe. As soon as you put that collar on them they change. They focus on task better and follow commands better. This isn't bad training on my end, just the nature of high energy dogs.
If you go out and find a serious hunting dog that hasn't been trained using a collar I'd be surprised. Having control over your dog when hunting is important. If you can't see the dog, just saying "stop" doesn't work. They're on task, nose down going after birdts and could easily keep on moving.
Obedience training and field training are two different things. LIke the difference between driving a moped and an 18 wheeler. Sure, they're both vehicles and have wheels, but that is where the similarities end.
BTW, I love my dogs too. Don't be a ******.