Sorry if this has been addressed a lot already in these forums, but I haven't found it.
I'm really interested in purchasing a Rk24 or Rk37 tractor. It seems like what I can get for the price point (with backhoe, 4x4, and loader) is substantially better ($5-7k acquisition cost) than what I can find from JD or Kubota. Not only that, I would get many more features for the price and what appears to be a much better machine overall. I understand that resale won't be as good for the RK Tractor, but I don't care all that much - I'd rather have the best tractor for me, not somebody else.
I don't think you would have a problem getting RK to ship parts to you. What you wouldn't have is the ability to have them show up to service the tractor or a place nearby that you could take it for service. That only becomes important if something big goes wrong. You are used to wrenching on the Oliver so routine service needs shouldn't be a problem.
As far as price goes, I've gotten quotes from my local Kioti/LS dealer that are competitive with RK (at least for the open station models), but everyone else is quite a bit higher. A TYM dealer should also be able to get close as well. All the major players were substantially higher. I've looked at Deere, Kubota, New Holland, Massey Ferguson and Mahindra and haven't convinced myself they are worth the premium. That $5,000 extra that the green alternative costs would pay for a backhoe on the RK24, or buy the grapple and a new brush hog. ...and have some left over to put toward a trailer to haul it on.