Define "White"?
If you mean white color from Polycarbonate, just like in MBW and pre 2008 iMac, i'd say no thanks .. That's a definite downgrade from current iMac, unless they are priced around $800 and using 17" screen, there's no reason Apple going back that way
But if the white comes from color-anodized aluminium, that would be a welcome change. In fact, Apple should make options about iMac colors. Since aluminium able to be color-anodized, with outstanding durability and color consistency, then I think it's time for us to see red, orange, blue, purple, or even green iMac .. just like old times 1998 iMac
Only in aluminium, and iX sandy bridge intel processor