CPU: 64-bit vs 32-bit DualCore

Hello,

I am planning to buy a new pc for CAD/CAM/CAE. Now, if I have to choose between two CPUs, which one should I prefer:

1. 64-bit single core or
2. 32-bit dual core HT?

I will mainly use the pc for:

1. office applications;
2. Internet;
3. CAD: small to medium size assemblies, parts with medium complexity (Solid Works, Unigraphics);
4. CAM: medium complexity NC programs (Unigraphics);
5. FEA: dynamics, statics; medium size models (usually