Ok Ed, thanks for that.
Can I just ask... what would you recommend in terms of sound modules if I was to go down that route?
A friend has recently given me a loan of a Roland XV 2020. It sounds good, but you need a degree in astrophysics to program the thing (and I'm led to believe that without a lap top, it's not much use in a live situation).
By the way... I've had a look into the Yamaha and the Nord synths that were recommended. The Yamaha looks like a spaceship and to be honest, I probably wouldn't have any use for most of the things on it (like the onboard sampler and sequencer, for example). The Nord looks great, and I'm gonna do more research into it. I have fears, however, that those Nords are gonna be really hard to get a hold of second hand.
_________________________
David