Thanks to everyone for all of the great input. This is a fantastic thread!
Theo and ewest-
We will definitely feed when we embark upon this project. I think that is essential for HSB, given the unpredictable nature of crappie spawning. This would also take a little heat off our forage base. On the other hand, Theo and burgermeister have great ideas. I think withholding feed depending on crappie recruitment in a given spring or when the yoy are great snacking size could really help maintain a balance. I'm sure we'll have to do some supplemental stocking of HSB until we find the right balance. Having no recruitment with HSB is tough on one hand, since we'll have to maintain their numbers for them. But the flipside of no HSB recruitment is that crappie will be the only predator capable of reproduction. I think that increases our odds of actually making it work.
Bobad- I am with you on your "feature species" analysis. Let's just say that ever since I've read PB, crappie have regretted it. However, I think we'll take a chance on them this time. Even in a pond smaller than you'd normally see crappie, I think they can be a feature fish, given that no LMB/BG would be present.
I guess we're just looking for something "different." As much as I love LMB/BG/CCs, I think it would be a blast to have a unique pond with unique species. A HSB/crappie pond could provide an alternative angling challenge for family and friends. Besides, having crappie will "force" us to use angling pressure to keep the numbers down. It's a nasty chore and crappie taste awful, but someone's gotta do it.
If nothing else, we'll learn a lot.