I don't know what happened to my previous post. But the ones you mentioned are all entry-level boards trading on a name. A Pa50SD would be better than any of them! If you're not wedded to the old MicroArranger O.S., a gently used Pa500 or Pa600 would be much more capable, and similar in price.

I get excited about new gear too. But I then I scrutinize the manuals, and I'm disappointed by marketing schmaltz.