If someone offers a smokin' deal (say 25%+ off) on Sandy Bridge after Ivy Bridge hits the market, I'd consider building with an SB.
On a Z77 motherboard, of course. I don't give a fig about PCI-E 3.0, let alone multiple PCI-E 3.0 video cards, and I could be persuaded to overlook the difference in power consumption. Don't care about overclocking either. But the Z77 chipset has other nice features, even without an IB.
It would be interesting to see an analysis of the total lifecycle cost of roughly equivalent (performance-wise) Sandy Bridge vs. Ivy Bridge CPUs. I typically hang on to hardware for as long as it keeps working, so I may actually be better off over the long haul, by paying more now for an Ivy Bridge CPU.
Exactly.
Z77 has a lot to offer (any LGA1155 K CPU) that has exactly squat to do with PCI-E 3.0 - for a while, I had been considering an i5-2500K/Z77 tag-team for precisely that reason. And while there are within-brand premiums for Z77 over Z68, that's now mostly reflecting several Z68 motherboards going away (BIOSTAR's own TZ68A, TZ68A+RCH, and TZ68K are all on the closeout block, as are ASUS' P8Z68/GEN3 subseries), and even a budget price war (ASRock's Z77 Pro3, Extreme3, and Extreme4, ASUS P8Z77 V-LX/LK/LE, BIOSTAR's TZ77A and TZ77XE3/XE4 - nine Z77 ATX motherboards under $150, and that doesn't count anything that Gigabyte or MSI is doing).
The fact that Ivy Bridge does NOT require tall overclocks to ring up higher IPC numbers is (for those of us that overclock more sanely by choice) can, depending on price, make i7-3770K (and i5-3570K) a saner choice than the Sandy Bridge K CPUs (so far, the only review that touched upon i5-3570K at all is from TechSpot - I want a more in-depth review) -price will now be the determining factor on the CPU end.