The difference is negligible in terms of the processor itself in gaming or not. However the 930 has more pci lanes and can support dual x16 SLI/Crossfire, or more! Also, in the future you could upgrade to a 6-core cpu, but as far as I know any cpu's that aren't currently out won't be on either platform (1366 or 1156).
If you can afford the stuff that will make the 930 better (expensive Mobo, extra GPU, triple channel ram) go for it! It'll give you better performance, you'll have fun OCing it, it'll look good, everything you ever wanted. But there's really no guarantee that in the future a few new parts will give you any real performance boost, so the time until you do a complete rebuild may not be too big of a time difference (it's hard to say though)
If your trying to save a few bucks, go with the 860, 1 GPU , the dual channel ram, and you'll still rock out the latest greatest games for quite a while.