BEST Thermal Paste for i7 ?

Artic Silver 5. The only reason to use ceramic-based thermal compound is when there is risk of shorting something out. That isn't the case with CPUs.
 
Arctic Silver 5

http://www.arcticsilver.com/as5.htm
Arctic Silver 5 was formulated to conduct heat, not electricity.
(While much safer than electrically conductive silver and copper greases, Arctic Silver 5 should be kept away from electrical traces, pins, and leads. While it is not electrically conductive, the compound is very slightly capacitive and could potentially cause problems if it bridges two close-proximity electrical paths.)

Unless you're going to lather it all over the PCB, I wouldn't worry too much about it though. I used AS5 on my GPU and it really improved my temps. As long as you know what you're doing, you shouldn't have too much to worry about.
 
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