SLI = teh sex
I was skeptical about the performance promised, but I did actually see ~2x power increase graphically.
As far as the 2 monitor thing, just to clarify, until the recent driver update, you could not use 2 monitors with SLI enabled. however, now it works fine from what I've read, I dont have a second monitor to test it on.
As far as the whole hard drive things... I have had nothing but trouble with my 1.5TB Seagate 7200.11 SATA drive.... more specifically I hate windows with a passion.
I prefer XFX nVidia cards over MSI or EVGA, prolly cause I have 2. Havent had trouble with them, overclocked, SLI
o_O