You could consider the Sigma 50 f/1.4 or the 70mm Macro in that case. Or the Canon EF-S 60mm Macro which is a really, really sharp lens!
Maxxevv... I'm unsure if you were writing to me. If you did, thanks (and I'll reply briefly below).
There are too many users with 'inconsistent AF' issues with the Sigma 50 f/1.4. A review of many 'in the field user sites' (eg FredMiranda, etc) - shows the number of people for whom this is an issue (a significant percentage).
I've also had AF issues with 2 previous Sigma lenses (not the 50mm f/1.4 though). Not that my 2 Sigma lenses didn't work 'at all' - but there is enough inconsistency that I wouldn't want to chance it on the Sigma 50mm f/1.4 at this stage. I know I could buy a lens and there is the possibly of returning it. My rigorous demands can't be met in a 'test in the shop' environment. So I will pass on that, though you're right it's a very tempting lens. But for AF critical applications, I'm going to stick with Canon or buy a lens that is rated by hundreds of users as 'consistent'.
As for the two other lenses you mentioned - the 70mm macro, and the Canon 60mm macro - they are too slow for my needs - as in, they are f/2.8 whereas I require a f/1.8 minimum. Thanks for your thoughts and comments / reply, though. Appreciated!