The non AE finder is a lot less expensive, so it might do if you prefer a handheld meter. I have had a 645 Pro and a Super in the past, really nice, didn't fit what I needed them for as well as an RB67, so I went that direction, but there are times I miss the easy handholding abilities of the 645. For Landscapes, and more formal portraiture, I absolutely love the RB67. For candid and hand held shots, the 645 is awesome.
I have been out of the market for a while so I am not sure about the prices. However, if the prices don't beat KEH pretty handily, I would want to buy from them to get the guarantee and return privilege, unless you know the seller and really trust them.