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Rather than go into detail, here's the big picture.
Ivy Bridge:
Better instructions per cycle (IPC), so similar clocks to SB will yield better performance.
Poorer thermal transfer, due to Intel manufacturing choices.
PCI-e 3.0 for future graphics cards, but little benefit with current generation.
More integrated controllers, specifically USB 3.0.
Sandy Bridge:
Lower, in general, pricing due to being "old."
Higher overclocks, in general, are possible.
"Only" PCI-e 2.0, but no real influence on the current generation of graphics cards.
Less integrated peripherals, generally leading to slightly higher motherboard prices.
If I were buying:
Pair a 2500k with a Z77 based board. In the future, you can switch to an IB processor, while getting a cheap and excellent overclocker now.
Additionally, read the Asus direct copper 2 review on this site. It may be worth getting, in lieu of what you have said. If it isn't, then at least it's something to consider.
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You haven't seen anything until you've seen this.
*pokes computer*
Wow! I didn't know the blue screen of death could get a blue screen of death.
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