I do have a Hiniker 5000 cultivator with guidance on it too. I was thinking of trying the JD cultivator with it but I have to use my 5088 to run the guidance and it's harder to keep off the rows in the side hills because of the 18.4 tires vs the 16.9 wheels on the 856. 

I missed out on a nice Hiniker 6000 with guidance at a Auction this spring for less then $2k. My 5000 is OK, but...... leaves something to be desired. 

Would really also like to find a later model Buffalo to use instead of  my Hiniker.

Still would like to have a front mount for the 1st pass on small corn or maybe a Lilliston rolling cultivator.

BTW, I plant with 6 row. Am a pretty small farmer!