Get the T6600. The SU is clocked at 1.3Ghz, whilst the T6600 is clocked at 2.2Ghz. Almost a Ghz faster. The only difference is the SU has 3MB cache opposed to the 2MB cache the T6600 has.
But don't let that fool you. T6600 is the way to go.
OK, let me elaberate in your languge. The SU is 1.3Ghzx2 = 2.6Ghz and the T6600 is 2.2x2= 4.4Ghz. So the T6600 is almost double the SU.
(OK techies, don't go on a flame war. I'm just explaining it in the languge the average joe would understand, I know thats now how it works.)
Just tell it like it is... Pretty sure he gets it..It'll just confuse people in the long run that come here for info. dont gotta go full re-tard when half is sufficient.