I am looking for a mini excavator. For the little I plan to do with it I'm not sure I can justify buying new so I've been looking for a used one. My main purpose is to dig out stumps of buckthorn that may have three or four stems in them up to 3 inch in diameter each. There may be a few elm stumps and they can be up to twelve inches across. I will also be using it to trench through heavy clay with lots of rocks down to 5 feet It isn't going to be used commercially just periodically in a rather leisurly fashion around my farm. I will probably get a Kubota because I have a Kubota tractor and a dealer in my area. My questions are: 1/ At what point on the hour meter do you feel a machine has really passed it's trouble free operating age. I've seen machines advertised that the seller said was low hours only to discover he thought 3000 hours was low. I'm not sure that is what most people would consider low. 2/ Which mdel of Kubota would you recommend? and 3/ What other makes should I consider or avoid? Thanks!