Possible leak of Haswell.
I'm in your situation, and I was waiting to see if they release a 'Sandybridge E' version of Ivybridge.
If they do, then I'll buy that, otherwise, I'm not sure.
I started saving well over a year ago for Sandybridge E; by the time I'd enough for what I wanted - couple of months ago - I found myself in a dilemma.
I have an i7 920 atm, and just bought a second hand MB on ebay to replace the old one as it broke; I don't overclock as I do a fair bit of rendering, and don't want to risk shortening the system's life atm. Plus I'm new to the thoughts of overclocking.
I've also considered - due to the fact I render - going for a dual xeon, but the cost /cry. A couple of days ago I looked at AMD's dual chip options and they look interesting.
Sometime though, the more you look, the more questions you have.
There does come a time when it's a matter of just buying.
There will always be a new, faster, hotter(read cooler) cpu round the corner.