PB5 doesn't support quad core..does it
The 680i supports unlinked overclocking which is a great feature for me...first time overclocker.
It's nice to know I can SLi my gfx card if I want to and that quad core is avaliable.
Swings and round abouts really.. You could buy a PB5 now until you want to buy a quad core cpu and get a quad core mobo at the same time.
Or get the 680i in any guise and be done with it. It might be that by the time you want a quad core that AMD have pulled their thumb out and made a better cpu than intel so it might be an idea to just get a stop gap mobo as well.