As somebody that has been on both ends of the purchasing of tractors and equipment, I see an oversight that a lot of people are making.
Just because somebody has got the lowest price, doesn't mean that you are getting the best deal. When most tractors are purchased, the buyer is planning on keeping that unit for at least 10 years. That means that you are going to most likely do business with the dealer for that time. I have found that the guys that tend to sell for the lowest prices don't always provide the best support after the sale.
Be sure to interview the dealer you are buying from. Make sure that he has good parts and service department. Ask to see his facilities. A good dealer with a good service department will normally be proud to show you around. If he doesn't he may be hiding something.
The last point I want to bring up is buying out of your area. Again, think about the next ten years. What are you going to do if you have problems. You are correct if you think that your local dealer will repair your unit. They will also most likely provide you with quality service AFTER they have taken care of there own customers.
I know this seems like a bit of a rant. But again, as somebody that has seen both sides, I have seen a lot more happy people coming and going from the quality dealerships than the shops that lowball everything.