well, OP has clearly mention, he is getting i5 3570k and ivy cpu's does not work with z68 chipset until it's bios flashed.
Well, OP is asking for the Z68.
Z68 is compatible with IB.
Flashing the BIOS is so easy these days,
it took all about 20min to my mother in law to do it.
So, I think the Moazzam_Pkanyone can do it too, if needed.