R.S.I. solutions?

[Paddy]

All this keyboarding has finally caught up with me and I'm getting
aches in my fingers.
last weekend I did the round of the usual UK High Street shops - PC
World, Currys and Comet. I finally got a new Microsoft 4000 ergonomic
keyboard, but all the ergonomic Mice and trackballs were gone!.

I've finally tracked down a supplier with a large range of pointer
devices:
  http://www.keytools.co.uk/mice/default.asp
But I am unable to try them out before I buy.

I was wondering if any Pythonistas had been through this and found
something that worked for them?

- Paddy.