Thanks for the replies all, some good points made that echoed my own feelings as I thought more about the question.

I think that the upgrade is just a case of wanting to spend money and having the newest toys but it is effectively a side-grade at the moment from what I have...hell, even a single 580 is the same benches as the 460sli according to Anand, though I think the 3Gb framebuffer will give a bigger impact then they test for in the case of boxing.

Going to a Z68 chipset was enticing as Ivy Bridge will slot in to the mobo when released but do I really want to spend the time and money now for a 6-9 month stop-gap?

I think unless a really overpowering argument comes out I will likely just replace the 460's with a 580 and maybe switch the 60Gb SSD for a 120Gb SATA 3 SSD and call it a day until after Ivy comes out.....unless I wilt and go with 580 SLI for BF3, Rage, Skyrim, etc