EDIT: I didn't mean to sound short or disagreeable here. I was typing on my phone. It's a sincere question.
How many remotes you need depends on what you do. I have seen people on TBN say they absolutely could not live without as many as four remotes. For example, with a box blade with hydraulic rippers and hydraulic top/side link, you're at three spools. With a grader blade with hydraulic top/side link and hydraulic tilt/swing, that's four spools. Some people like to control a grapple on their FEL by running a hydraulic line from a rear remote up to the front of the tractor; if you do that, that's an additional spool that will be tied up whenever the grapple is on the tractor. As others have pointed out, if you're going to run a batwing, two is the minimum, but three would allow you to raise/lower the wings separately for finer control. On the other hand, if you never did box/grader blading and only ever wanted to run a wood splitter off your 3ph, a single remote would probably satisfy. The bottom line is that the "right" number of rear remotes depends entirely on what you intend to do with the tractor. More remotes opens up more options for convenience, comfort, and efficiency of work. And you will always be able to think of one more thing you could use a remote for, so if you buy two, within a few years, you may wish you had three.
Getting back to the hydraulic top link, I think whether you are going to want it will depend a lot on how much work you do with ground-engaging implements like grader blade, box blade, and so forth. Being able to change the aggressiveness of the cutting edge on the fly via a hydraulic top link is a huge boon. It really speeds up work. For me, I wouldn't benefit as much from being able to change the tilt on the fly, but I have heard others say that they'd take a hydraulic side over a hydraulic top any day. A hydraulic top link is also nice if you ever have three-point pallet forks or hay spear, because it allows you to angle them and keep them level as the hitch goes up and down--but with the loader on your tractor, that's probably not a use case you're worried about. On the other hand, if most of my work was mowing, well, I never adjust the top link on the mower once I have it set level, so hydraulic top wouldn't really help me there.
One other thing to think of (if you plan on selling this tractor down the road) is that more remotes is a good selling point.
Joshua - that was EXTREMELY informative. I know I need one remote so I'll probably get two. Probably the most hours will be mowing, but I will have a lot of disking and grading as well. Neither the disk, grader, or box blade I've been using have hydraulic adjustments, so maybe I don't know what I'm missing. I'm sure i could have used an adjustable blade when trying to level new pasture after pulling stumps. But the little tractor I was using was not up to the task so everything was VERY time consuming and difficult.
I have two remotes on my Kioti DK 40. I use one for Top link and other for Grapple.
OK, I've just reread the thread and made notes. Will call 3 nearest dealers, follow up with emailed request for bid as speced:
M7040 2012 model (doesn't have EGR but the 2013 does)
FEL with 3rd function remote & 72" Quick Attach bucket
2 rear remotes
items still to clarify -
drawbar clevis (do you suggest aftermarket or at purchase)
80 AMP alternator (was listed as an option and I will ask the salesman why I would care)
defogger (I think I should get this. Would be tough on a cold morning if the tractor windows fog as bad as a car does)
hooks on bucket (If someone can post a photo of a good set up would be much appreciated)
Many thanks for all your help.
Many people put in a slip hook for the center hook.
Generally, people will use grab hooks for the outer hooks. There are 2 schools of thought on the outer hooks:
1. Put them in line with the bucket rams, this way you want "rack" the bucket (ie: twist it along its "wide" dimension) by using just one hook with a heavy load
2. Put them on the outer corners, this way you risk "racking" the bucket but if you use both you can in some cases get a better grab with chains that are more separated.
Some people will also mount a 2" receiver to the middle of the bucket to put in a hitch to allow moving trailers more easily.