Hey wingnut, I can give you my experience however limited.
After reading the forum, and the dealer also gave me the name of a guy who had bought the same tractor, he was using it for the same purpose and gave a glowing report of the tractor and Kubota, I bought the B2620. The only smaller tractor that has a backhoe aside from the B2320(which is pretty much the same size just less HP) is the BX25, and I knew from just looking at it that I wanted something bigger.
I knew I was going to use the backhoe to its capacity what ever I bought so I wanted the biggest I could get given a tight budget, plus wanting to stay small enough for easier transport and maneuverability in some tight spots on my property. The BX25 is the best seller at this dealer but they call it an "estate" tractor, used mostly for grass cutting with a little back hoe work. My main use at this point is the backhoe.
Used tractors on Vancouver Island are in short supply, and when they do come around they don't usually have a backhoe attachment which means I would have had to go with an after market backhoe, which I wanted to stay away from.
Anyway I had to by new, but the resale value is so high, I could almost use it for 5 years and then make money when I sold it.
Hope that helps.
By the way I noticed you are from Northern Ontario, I grew up in The Soo.