Well, we went out shooting lastnight and a mate of mine, Susan, let me use her 100 macro for the night...
(LINK) and I think it will have to be the 100mm... I have only used the 60mm very briefly, but the 100mm will (thanks for all your thoughts) let me get a little further away from the subject, save me a little bit of shoulder ache (another lens in the bag!) and, possibly, upgrade to a fullframe beasty at some point... the 100 it is, now I just have to work out how to get it approved by the ministry for war and finance...hmmm
Cheers!
Sime™