I know quite a bit about the M700. It's a 600 series chassis with hydrostatic drive. It has a 30 hp. Wisconsin VH4D air cooled engine. That's coupled to the hydraulic pump with a u-joint that's prone to failure if not greased. The general purpose bucket should be 60". I purchased mine in a non-running state for $1950 (too much) but aside from having to rebuild the motor - repairs have been fairly inexpensive. You can have the engine rebuilt for less than $2000 (plus shipping). I'm asking $6000 for mine and it's in very good shape now. You can find them at used equipment sellers online for $2500 - $3500 in rough condition. What model backhoe attachment does the seller have. I'm looking for one.