For me.., several boards. I miss the old M1, and DX7. I also miss the Casio MZ-2000.

Talked to a guy the other day who found a mint condition Yamaha DX-27S that was owned by a family member and was rarely used. Seriously thinking about picking that up. It's no DX-7, but the 27S model was pretty cool. I could be wrong, but pretty sure it's from around 1985. I think the DX-21 and DX-27S were the only models with analog chorus. Anywho, the guy says he'll sell it cheap--of course my definition of cheap may be different from his