PC cooling help

[Diddy Kong]

Hey watch it pal my cooler rapes. Don't mess with the zalman lol

[Arpit]

No. Corsair H50 and H70 are present at TheITDepot.com, but they are somewhat expensive. And I really do not hope of OC my Q6600 beyond 3 GHz. Because I am afraid of Law of Diminishing results.

Water cooling, I think is not required for a mere 600 MHz boost.

This is Corsair H70 - http://www.theitdepot.com/details-Corsair+Hydro+Series+H70+CPU+Cooler+(CWC+H70)_C10P8656.html
and H50 - http://www.theitdepot.com/details-Corsair+Hydro+Series+High-Performance+CPU+Cooler+(H50)_C10P5870.html

And The Hyper 212 I am planning http://www.theitdepot.com/details-Cooler+Master+Hyper+212+Plus+(RR-B10-212-GP)_C10P6365.html

Just see the price tags. That's why I want 212. But the chassis size is haunting me to buy small one. Can you help me if I post a screen of my chassis with reference scale?

I just measured the gap between MoBo and side cover, the distance is 16 cm. Now, can I have it installed or keep my chassis open all day long.