I know this might sound kind of stupid(and kind of a waste of money), but if you have a 4x12(or any other cab with a bit bigger speakers) just drop your 610 off at your practice space and use it with the 4x12 before selling it. See how that sounds. You might change your mind about selling it. When you play a show just use the 4x12(or whatever else) until you can figure out a way to transport and use both cabs at a show assuming you do like it.
I really think that they'll compliment each other nicely, at least they do in my case as I've already stated.