which of the 3 you suggest for best heating management ?
and as of VGA I have 2 concerns, first XFX or Sapphire ppl saying doesn't matter so I guess I will got with Sapphire unless someone tells me not. Second, is there by any chance ATI cards will face problems with FFXIV since it is nVidia game ? because I am building this for FFXIV and that by itself the 1 million $ question ;p
There will be no major features lost but I can almost garuntee there will be options in the graphics that can only be implemented on nvidia cards. That said there is no price/performance competitor for nvidia at your budget level closest would be 2 470's sli.
Id go spedo as it looks like its been build to actually cool not look flashy. Also check that the case you pick will actually fit the 5970 (13.1inches) and also use some cable ties to secure the end of the 5970 to some point above it in your case, my friend uses his power cord connection and ties the cable tie to the grill of his case as the weight of of the 5970 broke the pci-e slot on his old motherboard.