I've used the stock pulleys and gone straight to the alternator with very little belt wrap on the water pump, but the way I like to do it is to use ProCharger's Idler which goes above the water pump and gives you a good wrap all the way around. Let me look for a pic...
Note, those pics were taken in 2003. Yes, I know they look like they were taken on a potato.
Thanks Noobz347... I also dropped him a PM and he replied quickly stating that he had no issue running a non-grooved water pump pulley with his set-up...
At any rate, I ran my belt according to one of the diagrams here... I still have yet to really test it because I am still finishing up the fine tuning after installing the Eibach coilovers and all the other stuff that came along with that, the UPR K member... manual steering rack... etc...