Need a good heatsink for SFF PC

[TheLastCat]

Hi guys, I recently bought from Newegg a new motherboard, an i5 4690K, 4GB DDR3 RAM and a 500GB HDD. With all that out of the way, I was looking for a good heatsink that fits in small form factor computers that allows better cooling than your regular Intel stock heatsink and allows light CPU overclocking. any recommendations? Will be playing heavy games like The Last Story, Super Mario Galaxy 1 & 2 and One Piece Unlimited Adventure.

This is the case I will be using:

http://i59.tinypic.com/oavurm.jpg