Are you sure about the SD hunt Dave? I did a little searching and it looked to me like it was B&Y eligible, but not P&Y. The trophy bull hunts are limited to rifle only according to the SD State Park website.
In any case, buffalo are a really unique animal to hunt if you can find a fair chase place to do it.
As mentioned, if you aren't hung up on a trophy bull, consider one of the cow only hunts in Utah Henry Mountains. Although the draw is still difficult and may take a number of years to pull a tag, the odds are much better than the bull tags.
As far as I'm concerned, a cow bison IS a trophy!
Here's mine from December 2012.