That's a very good price on the 4110.
For comparison to the 7610, well, they're really very different tractors and your should drive them both. The 4110 is a full featured tractor, the 7610 a bit more striped down. I've been consistantly suprised to find out what the 4110 has that the 7610 doesn't, and also to find that a lot of people don't really mind the missing features, so you need to decide that. Note that few things are listed on spec sheets. For instance, the 4110 doesn't need a clutch (doesn't have one.) You need to be through in your study. Ask both salesmen why theirs is the better tractor. While the answers can be amusing, they can also be telling.
If you do a search for 7610 and 4110 going back a year, you'll find this compare has shown up a lot. Based on the feature set, Kubota doesn't really have a tractor to compare the 4110 against, but like I said, not everyone cares about the extra features. I looked at both very carefully before I bought.
Since I have a 4110, you should assume what I say is biased whether I sound biased or not.
Cliff