I have a 2910 and think the price difference is well worth it.
First, let me address some slight misperceptions I detect in the posts. The 2710 does not have the same kind of cruise control as the 2910. The 2710 just has a binary switch that locks in whatever speed your gas pedal is at. The 2910's cruise control lever can actual vary the travel speed, like the gas pedal, and then lock it in wherever you position the lever. That said, I find cruise control to be completely useless for my mowing. It might be useful if you have long stretches of field to mow; I don't. You can also brake steer with the 2910 cruise/acceleration control, another dubious ability.
Second, there is a toolbox on the 2910. It is not under the seat. It slides into a bracket underneath the seat assembly, just above the left rear wheel. My dealer didn't know this either.
Speaking of seats, I find the 2910's spring seat to be a SIGNIFICANT improvement. I would pay $300 for it alone. The extension arms are not important to me because I use Freedom Hitches, but many antiquarians here consider the extensions to be a very useful improvement for that otherwise pitiful interface known as a 3ph.
Finally, I think 3 more gross hp, 2 more pto hp, and 10 more engine cc's is a significant difference. You may never notice it, but with 23 acres and the kind of property and jobs you describe, you may very well. In fact, with that much property and a house to build, you maybe should even be thinking of something bigger than a 2910. Once you have your tractor, you will think of at least 3 times as many jobs for it to do than before you bought one.
Look at a 3710, as that is the largest Kubota that still can take a belly mower. Look at the Deere 4300. But don't look for unanimity here. Good luck on a long journey.
Glenn
