ES means Engineering Sample, so unless you have connections you'll have to wait for a regular one. Plus the list price on an X5667 is $1440.
Hex High End:
Xeon X5680 (3.33GHz, 130W, 6.40GT/s QPI): $1,663
Xeon X5670 (2.93GHz, 95W, 6.40GT/s QPI): $1,440
Xeon X5660 (2.80GHz, 95W, 6.40GT/s QPI): $1,219
Xeon X5650 (2.66GHz, 95W, 6.40GT/s QPI): $996
i7 980X (3.33GHz, 130W, 6.40GT/s QPI): $999
Hex Low-Power:
Xeon L5640 (2.26GHz, 60W, 5.86GT/s QPI): $996
Quad High End:
Xeon X5677 (3.46GHz, 130W, 6.40GT/s QPI): $1,663
Xeon X5667 (3.06GHz, 95W, 6.40GT/s QPI): $1,440
Quad Regular:
Xeon E5640 (2.66GHz, 80W, 5.86GT/s QPI): $774
Xeon E5630 (2.53GHz, 80W, 5.86GT/s QPI): $551
Xeon E5620 (2.40GHz, 80W, 5.86GT/s QPI): $387
Quad Low Power:
Xeon L5630 (2.13GHz, 40W, 5.86GT/s QPI): $551
Xeon L5609 (1.86GHz, 40W, 4.80GT/s QPI): $440
I think the E5620 will be the one to get if you're looking for quad core 32nm s1366.
X5670 review:
http://it.anandtech.com/IT/showdoc.aspx?i=3769