Well after a long day I got PS Groove running on the RZUSBSTICK.
This was no mean feat as it has no way of being programmed unless you have access to a AVR Jtag programmer which I didnt. I had to modify the stick to allow it to be flashed using ISP. I purchased a USBtinyISP kit v2.0 which comes in kit form and had to be built first.
I stuck with RZ as it has one of the smallest form factors an fits nicely into a USB wifi dongle case I had lying around.
Its got to be the hardest hardware version to get running unless you have the right JTAG kit. So if you do decide to go for it you will need a steady hand and be pretty good at soldering
The stick seems to be instock in quite a few places.
Instructions on how to modify the stick to be flashed with kit:
http://ossmann.blogspot.com/2010/01/...on-budget.html Thanks to the blogger
USBtinyISP Kit can be purchased in the UK from: http://www.oomlout.co.uk/avr-program...d9f85ce2dc3f2f