I have a UC300eth-5lpt plus a C10. I don't remember what any of it cost (thankfully) and the AXBB-E didn't exist at the time of purchase, but the setup has been very good. It's better than my ESS was.
I use a MX3660 and a G540 to control 4 axis (one is the ATC). I use those BOB's on both of those units plus the C10's.
There's more than one way to skin a cat, as you well know. Find the items the give you the feature you want at the price point you are comfortable with.