get the 640mb version over vista
in bioshock your not going to see that much of an improvement in graphics
but if u want vista that bad
pm and ill show u a free way....
antec 900, q6600, 4G, 500G, 160G, 9800gtx, 780i, 47in 1080ptv, 5.1 surround sound
MacArthur wrestling pwns!