If you are buying new components, look very hard at Ag Leader. The Insight monitor is very good and easy to use. Ag Leader will have whatever you need when you trade combines and need to move it to another machine.
I only wish my 2600 was as easy to use as my Ag Leader.
John Deere makes very good equipment, but their software is strictly low rent. Also, check out the operating and storage temperatures on the 2600 before you buy. Get them in writing, not a salesman's word.