The only recording one I've seen stateside is Mister X's CRS-5000
It's time to kick this thread back into action, make sure you read through the whole thing, I'll be adding to existing posts so there's some order....
stereo2go.com
Marantz (Superscope) made some amazing machines, including the PMD-430 which goes head-to-head with the WM-D6, although it's much larger, so they were a player with portable recording machines.
In the 70's a lot of boxes were sold with stereo taping in mind. Options like stereo mics, mic-mixing made these garage band favorites. Tascam Portastudio one-upped it with their four-track recorders.
HiFi boomboxes is another subject, there's a bunch of "compos" that might make the cut but at the end of the day the tiny speakers they came with have a hard time lighting up any room