I have a 2006 JD 9660STS. It has the big feederhouse lift cylinders, has HD variable speed FH with oil cooler. It does NOT have the High Torque FH, I currently have a JD 893 with knife rolls. I am thinking about upgrading to a 8-30" chopping corn head. I'm thinking about a 608C Stalkmaster, Drago 8-30, or Geringhoff 8-30. Any pluses or minuses for each? I am leaning towards JD, dealer is 15 miles away. Heard trying to get parts for the others are hard & expensive.