I run a 6430, same hp with FWA and a loader. Make sure it has large hydraulic pump and add a case drain line for blower motor. I run a 6 row 3pt planter and I does fine. I did add some custom made duals to help with traction.
John Deere is making too many tractor models and it is getting confusing. I believe the M models are stripped down and have open hydraulic systems. They made these cheaper to compete with road departs for bidding on mowing tractors for road ditches.
The D series is cheaper and designed to compete with Kubota and other middle east tractors. The M series is in the middle yet I think the M series is closed centre its sorta like a new version of the 6010 and 7010 series (a 6150M looks like a 7410 inside sorta) The R series is the premium model designed to compete with high spec massey, fendt and cnh tractors