I wonder if anyone out there has played with Kaypro/Topaz S-BASIC at all? It's meant to have good structure and a Z80 CP/M compiler as well but I've had a lot of trouble tracking down info on it, especially documentation. I'm interested in giving it a try on the PCW.
I believe the original manual was incredibly poor, but there was reportedly a 2nd edition which was much better and provided a good guide to the language. If anyone has one I'd love to get a scan (or happy to pay for the original and will put up a scan online myself)