As far as I know JD has the D series(Mexico), the M series(German) and the R series(USA).
They are priced accordingly.
The D's are low frills economy tractors, the M's are nicer but not too fancy(rancher style), and the R's are loaded with the latest technology(farmer chit).
I would love to get a slightly used 6145M or similar but they are pricey.
Actually I'd like to find a low houred 7610, 7710, 7810 but they are rare.
They have that E Class John Deere now. El Cheapos.
My tractor mechanic said "Run!".