I think bare minimum depends on how much money you want to spend. My opinion of a bare minimum setup has changed since I started. For me, I would want to have a 6 gallon Better Bottle for my primary, a 5 gallon Better Bottle for secondary (there is much debate on if you even need to do a secondary), an Auto-Siphon, a Bottling Bucket, Bottle Filler, a Bottle Tree and Vinator, and (assuming you're going to start out doing extract batches) a 5 gallon brewpot.
Nevada Testsite Brewery
Bottled: Belgian Dubbel, American Pale Ale, Irish Red Ale (Yeast Fuel experiment), Doppel Bock
Up Next: Brown Ale