I think that the 57/57+ set is one of the few sets from Gibson that I would actually recommend, but they are pricey. Unless you can afford the 57/57+, I'd say go with the Alnico II Pro because they are so similar to the 57s, but a lot cheaper. They both have the characteristic sounds of A2 pickups: rounded treble, prominent mids, and loose bass.
Also consider the Slash set. It's a rework of the Alnico II Pro set that was designed to sound like the A2Ps that were in a really bright LP. The Slash set is brighter and a slight bit aggressive sounding. It's a better set for a darker guitar or rig, but if you own equipment that's on the brighter side of things, go for the original A2P.