I own a 5525 JD with 4 by 3 trans with power reverser and economy pto. Really like that tractor and in process of selling it as stopping with farming. I have looked very carefully at about 60 hp in the JD 4066R and Kubota
L6060 and Yanmar. I currently own two Kubota's and the best tractor I ever operated by far has been my JD 5525.
NOW JD has two 4000 and 5000 series or models of each. In the 4000 the M is the more basic and thus lower price. In the 5000 series the E is lower price/basic one. From what I have heard and hear the JD 5000 "E" model is, well a low quality tractor. Have had a JD dealer I greatly respect tell me it is, "A PRICE POINT MODEL" which I understood was hp for cheap price and that was it. No doubt there are many 5000 E owners who are pleased with their tractor but can tell you search MACHINEFINDER.com and you will find many 5000 E tractors for sale. Local Kubota dealer had two that were less than two years old on his lot this winter. The other 5000 JD you will find few for sale used.
I have been searching in the about 60 hp range for smaller tractor than my 5525 due to stopping farming and want lighter tractor for working in yards and tight places with smaller frame. Look at what you will be doing work wise. Know what implements you will need and find out what hp they need and work backwards. Smaller tractor often can mover quicker and in tighter places but may not be able to handle as big a task as you may need to do. Too big a rig is waste of money and time...takes more to haul them and set up. Have a friend who farmed row crops and so did I. In large fields his big rigs would run past me but in smaller fields I could work faster than he could. You need to know your needs as much as possible before you buy.
Hope you well in your venture.