why wait? the H6x, P67and Z68 will support ivy bridge when/if the manufacturers upgrade the bios. check with them to see which boards will have a bios upgrade.
with the z68 board you can dump the raptors and use an ssd to cache for one the platters you have. the sandy bridge pentiums or celerons do not have an igpu. if your doing video encoding, it would be wise to look at an i3 2100 for intel quick sync or the 2125 with HD 3000 graphics for much better video playback than the 7800gtx would support. (if i remember correctly it is the 8xxx or above that supports Nvidia's "pure video")
btw, the x79 chipset will not be ivy bridge compatible, it is for the sandy bridge-e socket 2011, both sandy and ivy bridge are 1155 sockets. what you will be cutting yourself short on is the ivy bridge will support pci-e 3.0. though since you do not seem to need to want a high performance discreet graphics card; it prolly won't matter to you.