Dimension 9200C - Overclocking (Part 2)

Overclocking is out of the question!!!

So my last hope is to upgrade the CPU.

On previous conversations, someone mentioned a few Intel Core 2 Quad & Intel Core 2 Duo Processors.

I guess I am down to 6 now!!!  Which processor would be compatible with my machine and would have the top performance?

Option #1: Intel® Core™2 Quad Processor Q6700 (8M Cache, 2.66 GHz, 1066 MHz FSB)

Option #2: Intel® Core™2 Quad Processor Q6600 (8M Cache, 2.40 GHz, 1066 MHz FSB)

Option #3: Intel® Core™2 Duo Processor E7400 (3M Cache, 2.80 GHz, 1066 MHz FSB)

Option #4: Intel® Core™2 Duo Processor E7200 (3M Cache, 2.53 GHz, 1066 MHz FSB)

Option #5: Intel® Core™2 Duo Processor E6700 (4M Cache, 2.66 GHz, 1066 MHz FSB)

Option #6: Intel® Core™2 Duo Processor E4600 (2M Cache, 2.40 GHz, 800 MHz FSB)