Thanks yet again starkwether. Following your post I went off and did some research on the modules you mentioned. I found a few useful videos on YouTube on Warps, Peg and Maths. I can see how easily a planned 'small modular system' could quickly get out of hand, haha. Still, budgetary restrictions in my case are probably a good thing - I can't immediately build a huge system that would be very difficult to get my head around at first.
I also discovered a new Doepfer module that I think would come in useful, being a combination of various functions, details as follows: A-184-1 Ring Modulator / S&H/T&H / Slew Limiter Combo. Still not quite ready to pull the trigger yet though!