Agree with Mark, you are unlikely to ever need a second 5970, unless you're running a massive resolution. When a single 5970 becomes insufficient it may be wiser to just replace it with a current gen card at that time. But these are four PSUs that will have enough power to handle two 5970s and are quite high quality: http://www.newegg.com/Product/Productcompare.aspx?Submi...|17-139-007^17-139-007-S01%2C17-256-057^17-256-057-TS%2C17-171-049^17-171-049-TS%2C17-139-013^17-139-013-TS
Thank you all for your advice,
i should have said i'm going for normal hdd's apologies. As for your comments on the second card i will not get another one, maybe use the cash on an ssd instead.
As for the psu i will look into the corsair 850hx.
Thank you all once again for your time, responses and recommendations.