Kawasaki made the 695cc engine for the MX.
Of course, I'm partial to kawasaki. I haven't killed my mule yet. Don't know if i can. It's been a great machine, for being 22 years old.
BUT, that being said Honda makes a good machine as well.
the main thing i would consider, is dealer support in your area. It's not IF it breaks down, It's when.