A hunting dog is a big commitment. Bigger than just getting another pet.
Most of these dogs have allot of energy and a drive to hunt and they need to be ran and trained and hunted regularly.
That being said... If that's what you're after.... Then you need to decide what you want and what you want to hunt.
Are you wanting a retriever for waterfowl? A bird dog for upland game? There are dogs for squirrel, for rabbit, for raccoon, for bear, for deer, for mountain lions, for coyote, for hogs, pretty much you name it, it's out there.
Your local regulations will factor into this decision obviously.
The world of hunting dogs is huge. Narrow down what you're specifically interested in and you'll get better suggestions.
-Jake