Mo, I don't know if it's best, because I haven't tried a lot of them. Some of them had very bad reviews. George Kaye told me the Behringer wasn't very good. Some of them are too heavy.
I'm familiar with the PCR M80, and the PCR-800 is an upgrade and offers more features, so I'm going there next.
I'm using the Ketron Midjay for module. I think it sounds GREAT, and very live. I'll try to post some songs soon.
DonM