The Pianocade is an open source MIDI controller and simple synthesizer with an arpeggiator. It’s made in Canada and based on the Atmel AT90USB646e. It’s about $325. Remember some fun in the studio can be inspiring so it gets my vote!
“The Pianocade is a synthesizer designed to sound, look, and feel like vintage arcade games. It’s easy for people who want to dive right in, powerful and feature-rich for people who want to tinker, and fun to play for everyone.” – pianocade.com
For more info: pianocade.com