So far I saw that the main difference between Ivy and Sandy bridge are the Graphics Features.
WRONG… they are different architecture. the 3820 is vastly faster like 40% faster than the 3770k
the question is do you need that power.
processor pricing is nearly the same
motherboard will be a little more for X79
you need 4 x sticks ram with X79 vs 2 with Z77.
the other option is to wait for Haswell/Z89 coming June2
its also the same price as the 3770 and runs as fast as the 3820.
the X79 is more robust