Sandy Bridge + P67 vs Nehalem + X58

I am going to buy new SolidWorks 2009 + WinXP 64Bit workstation.

But I can't decide which combination of CPU + chipset is better for SW performance.

Header 1Option 1Option 2
CPU

Nehalem  i7-960

Older and slower CPU

Sandy Bridge i7-2600K

Newer and faster

Chipset / Motherboard

X58

triple-channel memory controller

P67

double-channel memory controller,

SoketLGA1155LGA1366

I need your advice...

SolidworksAdministration