Gelid GC-Extreme Thermal Compound
This is a top performing thermal paste from highly respected Gelid and the winner of numerous industry awards. It's rated at a conductivity of eight point five watts per meter kelvin (8.5 w/m*k) which places it at top of class. Keep in mind, it's a little thicker consistency than some of the other compounds on my list, so it's a little harder to apply, but all-in-all it's still quite acceptable. It is sold in 3.5 gram tube and comes with an applicator made of flexible plastic.