Only Hex cores that Intel make are on the 2011 platform, which is well into the high end desktop domain.
Dont think there is anything larger than a Quad core on the mobile series. Even the "Extreme" edition processors on the mobile range are only Quad core's with Hyperthreading.
I am looking for a brand name desktop with those hex cores. The reason I want a brand name is just for the support really. I am sure I can get it custom built but companies like HP makes the support and replacement a breeze when there is a problem.