You won't even notice the difference in the two chips. As for overclocking, depends on what it can handle.
If you buy the 6750 (which suprised me because it is $45 cheaper) and new RAM check out newegg for Corasir XMS2 800mhz. Can handle overclocking well and 2GB after rebate is $29. Yup that's right $29. Just make sure you get the right stuff. Some is 2.1 volts and some is 1.9v. My motherboard only supported 1.8v, the 1.9v is fine just up the voltage in bios. So if you go brand new, the motherboard will be the only difference in price. The 6750 is $185 + $29 ram= $214. So it's for you to decide on Motherboard price minus $16 for brand new, or $230 for used. Can't make that decision for you. Of course you say he will throw in an after market cooler, depends what it is. If you plan to do any serious overclocking a cheap one won't do it.
The 6750 supports a faster FSB and is a little faster, but I don't think you will see the difference.
Peabody
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System Spec: Gigabyte GA-965P-DS3, PentiumD Dual Core Presler 945 3.4Ghz, Gigabyte Geforce 7600GS, 2-1GB Corsair XMS2 800Mhz in Dual Channel, 2-WD 250 SATA 3Gb/s, Onboard Realtek HD 7.1 Audio, DVD ROM, DVD burner, Hiper 580 Watt Power supply, WinXP SP2.
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