Cache vs Ghz

[XTO --]

Im thinking about upgrading my comp, and im in doubt about which is better for me...

i5 650 (3.22GHZ 4MB Cache)
i5 750 (2.66GHZ 8MB Cache)



*Could be the 660/661 aswell (Both 3.33ghz 4MB L3 cache)


My main goal is gaming and video editing... If you guys could answer me which is better and why, i would appreciate

[XTO --]