Well, in OSX, you're essentially getting a 12-15% performance boost by going with Ivy Bridge. I think it future proofs the computer more. (11k geekbench score on the 2700k vs 14k on a 3770k at stock)
As far as the Z77-UD5H, the people who don't have audio working are plain installing it wrong. You don't need a DSDT, you don't need any crazy combinations of kexts, you just need one kext from Multibeast. That seems to be what people are missing.
Not having a DSDT is a BIG deal. Ever wonder why you never see talk of DSDTs on Apple forums? Because real Mac's don't have need for an extra one either. Gigabyte has been EXTREMELY helpful by making their motherboards not require a DSDT. It gives a damn-near-vanilla install (minus audio and ethernet kexts, which you have to install from MultiBeast).
Every Z68 has a DSDT, and while it works, and works well, native is native.