I'm doing it for a whole host of reasons really, mainly because I've got a whirring noise coming from one of the ancilliairies and i only replaced the PAS pump (for one out of a 94 touring) 5 months ago or so. I figured it made more sense to upgrade to newer components - I now have an 1998 80a alternator and a 1999 PAS pump. I also was aware that the crank pulley is a nicer item, although I've not been worried anout the disintegration rumours at high rpm, I nevertheless never liked the part that much.
I'm not sure how I'm going to make room for the dipstick though! It's very tight in there!
oh and if anyone else is thinking of doing this, don't bother unless you want a load of ballache, there are a load of problems to overcome.