Anyone know of the the best bluetooth stack for vista?

I currently have the toshiba stack v5.10.08 and my headphones seem to stutter a little when I am doing a lot. Probably something about how much ram and such the stack is using. (<yeah that probably sounds pretty idiotic.)

Anyway anyone know whether there is a better or faster stack out there?
Or anyone have any experience with trying different bluetooth stacks?

yes a bluetooth stack is a set of bluetooth drivers that handles how bluetooth signals are processed