would a strider 1500w be overkill for say 6x 5830s ??
5830's have a TDP ~150W, if you want to give yourself head room say 200W / card.
That's 1200W for the cards max, plus whatever power for your base system. I think 1500W should do fine, but I don't know much about the particular PSU. In reality I'd expect that system to come out ~950-1000W.