If you're going to buy intel, the T5450 does not support the VT bit -- which is used for virtualization. If you decide at some point to run an OS underneath your current OS for testing, etc., you'll want a CPU that supports hardware virtualization.
http://www.intel.com/products/proces...t/core2duo.htm
That AMD does support VT.
Of those two, I'd choose the amd. However, I would choose an Intel that supported the VT bit over either of those.