2x64 Bit none dual or 64 bit dual?

[jpcaissy]

I'd go for the dual CPUs. I always find it funny people saying that dual core is like having, for instance, 2x2.4 ghz. Sure, but they all share the same bus, thus information doesn't come in faster.
So from past experience, go with the dual CPU.

And I don't see the problem with installing 64bit's version of centos whether you are using dual core or dual cpu. Works like a charm if you know what your doing. Keep in mind that centos needs a bit more work than ubuntu which almost works out of the box