Ron, I've hunted SD for the last several years - I highly recommend it. We are actually leaving this Friday for our annual trip. We hunt around Winner, SD. There are literally thousands of places to hunt.
I looked at the link from LABWILD above. Looks like a great operation.
When looking, consider how you like to hunt. For example, my group likes to go off on our own, versus the large drives of 10+ people. This gives us a chance to enjoy the day with our dogs and know that we worked hard for our birds. In our five day trip, we will hunt the large groups 2 days, then hunt on our own the other three.
Also, consider the level of guiding you want. If you have your own dogs, then you may not want anything more than them moving you around from field to field. But, if you don't have dogs, I would suggest using a guide with good dogs (labs!) - too many cripples will get away without good dogs.
And, some people look forward to the "evening activities" more than the hunting. If so, make sure you have a decent sized town nearby. A town of 1,500 could have everything you need. But, down the road, a town of 5,000 will shut down at 5:00 in the evening.
I would suggest you head that way this year if possible for a late season hunt - it should be cheaper - and this will give you an idea of what you will want next year.
Check out J.R. Classic Hunts in Aberdeen SD...Patrick Flanigan Winchester exhibition shooter filmed a few of his hunts from here....All wild pheasants plus Aberdeen is a great town not far over the border of MN...http://jrsclassichunts.com/