Re: geforce 280 gtx sli debating about 480 sli...
I would definitely put that OS onto the ssd. Also, if there is still affordability, I would sell off your 780i mb, cpu and ram and gtx 280's. Get a i7-950 (about the same price as a 930 now), 6gb of ddr-3 ram and a asus p6x58d-e (it's the cheapest of the newest) mb's. Then you will see the score fly on a overclock.
gigabyte f2a78m-d3h mb, 32gb ddr3-2400 mhz ram in dual channel,amd a10-7850k 3.7 ghz quad core cpu, zotac amp extreme gtx 970 4gb vc,OCZ vector 150 240 gb ssd,antec 650 watt 80 plus platinum psu,corsair carbide 500r white case,lg 16x bluray writer, steelseries 6gv2 keyboard ,insignia 24' 1080p tv, logitech g502s 12000 dpi mouse ,xbox 360 wired controller for windows,visiontek usb 3.0 120gb ssd flash drive,windows 8.1 64 bit,creative labs sound blaster z pci-e sc,logitech z506 5.1 speakers
I'd rather walk with God in the Dark than shine in the light alone.