8800GT SC v. 8800GTS 512

Title says it all:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130312

v

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130319

on a 780i mobo with a Q6600 overclocked to 3.0 or 3.2GHz.

Would the GTS be worth the extra $50 if it was overclocked?

Cool, thanks.

Quick follow-up, should I get the $20 Advanced version of 3DMark06 or is the free version sufficient?