Yeah, everything is -uino nowadays, and this is no exception. Still, this one might appeal to some... The Ziloghino aims to be a modular microcontroller board with a 20 MHz Z80 CPU at it's heart. The basic kit consists the main CPU unit, a memory shield with Flash and SRAM, a Flash programmer shield, and an I/O shield. Pricing seems to be ever so slightly at the upper end of the spectrum, but fair enough for a small-scale project like this.
Read up on the details on the project's Kickstarter page and help out with funding if you like.