Hi there, and welcome. Please take a moment and add your location to your signature. That will help members respond intelligently to your questions.
I have a 2012 5083e. It's been a good tractor, so far. I think it has about 700-800 hours on it. No issues. I also have a 10 year old 5085M and a 5090M that I bought 1 1/2 years ago. Bought the e used, with 112 hours on it. Both of the M's were bought new.
You have to understand what makes the e cheaper than the M.
12 speed transmission instead of the 16. The 3 ranges of the e are not synchronized, the 4 ranges of the M are. But the forward-reverse shuttle works the same.
Lower hydraulic flow than the M series. That means what the M can do at an idle, you have to run the e up to 1500 rpm to do.
Nylon tires instead of radials.
4wd engagement is a mechanical lever. The M has a rocker switch that lets you choose between full-time 4wd and automatic 4wd. In auto mode, it senses wheel slip and engages the front axle as needed.
Standard hydraulic controls instead of electro-hydraulic controls. I use the outdoor, fender mounted buttons almost every time I hook up an implement to the 3ph, and I don't have to climb back into the cab to do it.
The standard seat in the e model is the cheapest thing JD could find. 90 degree metal bucket, (padded) but with no adjustment for the seat back angle. I bought a new air-ride swivel seat for my 5085M and put the M seat in the e. Much better.
The e model is adequate for most tasks, the M makes it easier. (nicer, more comfortable, etc) I put about 500-600 hours a year on the 3 cab tractors combined. When I'm cutting hay, that might mean 14-16 hours a day. Then, I drop the mower, and hook up to the tedder. The next day, I hook to the baler. And, down here, that process is repeated 4-5 times each summer. We cut, rake and bale with the M's. I just move and stack hay with the e. I want the radial tires and air ride seat, and I'm willing to pay for them.
If you're not going to spend much time in the tractor, and you don't need to change implements on a regular basis, you might be happy with an e.
And, by all means, shop around on price. I paid $72k for my 5090M in 8/18. And that was with the air seat, 3 sets of wheel weights on each side, the hitch buttons on both rear fenders, (comes standard on one fender) big Michelin radials, and auxiliary hydraulics (3rd function) on the loader with the thumb switch on the loader handle.
Hope my rambling thoughts have helped.