For a couple years, I've used a Tellichery Pepper blend that's available from Bed, Bath, and Beyond. Mostly Black, with some white, green, and red peppercorns as well. VERY good and aromatic. I'm currently using Cains bulk Black Peppercorns, but that's only because I can't justify the cost of driving 20+ miles, one-way, just for an $8US bottle of peppercorns.