Ok, the VX is definitely going to be too small for me and I'm not sure that the MS Arc is going to do the job from an ergonomics point of view. The other MS one looks ok, but again is a little small.
The Logitech MX1100 is a nice looking mouse, which would appear to be large enough - the only thing I think it's missing is the storage/protective case. I guess I can do without that though if it means I'm getting a decent mouse. Don't know how long it's going to last getting banged around in my laptop bag though
If anybody has any more ideas/recommendations please keep 'em coming