Mmmmm I've had many versions of Red Velvet cake that definitely had the buttermilk and cream cheese. However I've had two that were outstanding...extra moist, with a little more zip. However one was from a restaurant that will not reveal their secret addition, and the other was baked by a local woman who won't budge either. And she says it's a real simple ingredient, but letting people know might cut into her holiday sales. She makes several thousand extra bucks from this cake , of course mainly at the holidays. Biatch!
These folks are the ones that started my obsession and won't give up the recipe. If you're ever on Captiva Island definitely make a stop.
http://www.bubbleroomrestaurant.com/frameset.html