I got the Future Retro Revolution. I am very pleased with it.
Not sure if it is that easy to get a x0xb0x. Last I heared, they were out of parts.
www.future-retro.com
http://www.future-retro.com/revolutionoverview.html
I like the design. The sound engine is analog. The effects are DSP.
It got CV in and out. Gate Out. It can work as a converter for older hardware, so you can use midi to trig them.
You can use the sequencer to trigger other synthesizer.
Comparing TB-303 with the Revolution.
http://www.youtube.com/watch?v=SkALw4qZbRE
I did order this synthesizer from USA. I live in Norway. It took 4 days to get it.