I understand what you are saying yet have to agree with Dougtr. Even though I don't make a living with mine that doesn't mean that I can afford to have it down. A good dealer will take the time to answer questions even if you aren't bringing it to his shop; that advise sometimes is priceless. I spent well over a month dealing with fuel issues before realizing what it was... the tractor was delivered in October with a full tank of fuel but it turned cold before I added winter grade diesel to it. Had I called my dealer rather than trying to depend on friends, it would have been running the first weekend.I would agree with this if you are using the tractor to make a living (Farmer, landscaper, etc.) If you are that hobby user that puts 30 - 50 hours a year on it but it isn't critical to your living, I say a close dealer is much less of a factor. If you are buying a new tractor, you have to expect the mechanical issues to be very few and far between.
If you expect to be at the dealer being repaired enough that you need to stay close to that dealer, you are choosing the wrong tractor.
To the OP; any of those tractors would be a good choice. I'm a bit of a Kubota snob, but briefly was considering swapping my 3301 toward a geared 2610.