Most of the components look good.
I assume that with the Z68 board and the 'K' series processor that your planning on doing some overclocking. Just keep in mind that even though the Z68 boards support overclocking, the BIOS options are still fairly limiting. About 4.5GHz (40x) multiplier is the fastest I've read about. And I've heard that the system will down clock it automatically to save power.
A note on the SG05: its a good case for an ITX gaming build but there has been some concerns about the noise level of the PSU.
It might not be an issue though, considering the hardware your putting in it.
It's gonna be tight getting all of that hardware into the SG05, but it will fit and you're going to have a very nice mini-ITX gaming system when your done.
(and don't let anyone try to talk you into a mATX)