What upgrade do you suggest? (GPU)

Ok and what about the CPU cooler, what's good?
How much clearance (Estimate in mm if possible) would you have in the case from the top of the CPU to the side panel? Some coolers are too tall and will not fit in narrow cases.

Did you decide on the 2500 or the 2500K? If you chose the 2500K, were you planning on over-clocking and if so how much of an over-clock are you thinking of doing?
 
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