Given that you're a self proclaimed equipment junkie, I am sure after you've bought the FSQ106, you will next want to buy a 16803 camera with 65mm square filters to ensure you are covering the full image circle that the FSQ provides. Good times!
I haven't used either scope, although I do have a couple of imaging buddies who use the FSQ106. They are generally very impressed by the scope and the star colors that they get. I tend to agree with them and their quality of images show all that is nice about the FSQ. The newer FSQ106s are all made from FPL-53 lens, unlike an older generation of FSQ scopes that were made from a flourite element. These buddies of mine do have the older version of FSQ106, one of them does have the flourite element version not sure about the other one though - maybe that contributes a bit to the wonderful star colors and sharper images, I am not sure. Not that the FPL-53 lens is a slouch, but still.
Having said all that though, what is nudging you to buy something new? Just the "equipment junkie" aspect of it? Not that it is a bad thing, but trying to figure out what got you started in the first place.