Having a ton of trouble deciding which CPU cooler to take, ive made just about a million threads about it, heres hoping its the last one 
Basically, my Phenom II X4 965 gets a little hot and I DO want to overclock it to at least 3.7 from 3.4ghz, therefore I need a new cooler.
My 3 observations im really interested in are:
Titan Fenrir EVO
Arctic Cooling Freezer 13 PRO
Coolermaster 212 Plus
First question is how big would the difference be between the temperatures of those coolers, and which would be the best ?
I know the biggest is the Fenrir EVO, therefore:
http://p.gzhls.at/495831.jpg
Thats the screenshot of my Mobo, im using the BLUE slots, not the Black ones. If I were to go with Titan Fenrir, would I be OK ?
Another question is, no matter what cooler I go for, how big would the temp decreased would be and will they be big enough for overclocking ?
And lastly, Im buying a new case, and some members recommended me the CM690II Case, aswell as the HAF 912.
Which one of those 2 has better airflow and best cooling variants overall ?
Thanks

Basically, my Phenom II X4 965 gets a little hot and I DO want to overclock it to at least 3.7 from 3.4ghz, therefore I need a new cooler.
My 3 observations im really interested in are:
Titan Fenrir EVO
Arctic Cooling Freezer 13 PRO
Coolermaster 212 Plus
First question is how big would the difference be between the temperatures of those coolers, and which would be the best ?
I know the biggest is the Fenrir EVO, therefore:
http://p.gzhls.at/495831.jpg
Thats the screenshot of my Mobo, im using the BLUE slots, not the Black ones. If I were to go with Titan Fenrir, would I be OK ?
Another question is, no matter what cooler I go for, how big would the temp decreased would be and will they be big enough for overclocking ?
And lastly, Im buying a new case, and some members recommended me the CM690II Case, aswell as the HAF 912.
Which one of those 2 has better airflow and best cooling variants overall ?
Thanks