Poker 2, QFR and a Frosty Flake, Phantom, any of GON's customs (but these won't fit your budget unless you only buy a PCB and get the rest of the parts from some other board.), hand wired board made with a plate from an existing board and a Teensy. Least work is a Poker 2 or a completed Phantom.
A bit more way out is an IBM SSK with a programmable converter or replacement controller.