One thing I am slightly concerned about is adding a 3rd GTX580 which I plan to do in like months.
The SLI bridge for watercooling that I got is 2 way SLI compatible. Not sure if these guys sell a 3 way SLI bridge. Also there just isn't enough room in this case for an air cooled dual slot GTX580, has to be single slot.
I guess I could get one of the EVGA hydro copper 2 or something similar and try to connect it as a separate watercooled card...