What size of bale do you want
I would reccomend a 4x5 baler
NH 640 was made from 92-95
644 from 96-98
648 from 99-2001
BR740 from 2002-05
BR740 was made in 06-07
they are all the same baler just different yr models
I had a 6420 and in my hills it was a load pulling my 654 NH baler when it got close to full with a 4x5 bale