I'd go with Artic Silver too.
And yeah, don't put too much of it - a tiny pea sized spot in the center of the processor, and then apply the heatsink over it. Do NOT try to spread it on your own, and definitely NEVER EVER with your finger.

 

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Unless you are me. I used to finger spread that stuff all the time. Everyone says don't, but I never saw anything negative with my temps because of it. Though these days I follow the instructions and let the heatsink pressure spread it out. Stuff is hard to clean off the finger.

Well, you do it, it "works" sort off - I've also done it long time ago before I knew better - but your "body fluids", yeah, even on your clean fingers, will interfere and lower the efficiency of the paste. Not to mention spreading them is definitely less efficient than putting a pea in the center of the CPU and let the pressure of the heat sink spread it, it avoids air bubbles.
There's no point in using top notch thermal paste if you're gonna introduce air bubbles and other crap into it. You may as well use the basic stuff then.

 

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If you are like me and have oily skin then it can be risky.

AS5 instructions used to tell you to spread the paste out on the CPU in a thin layer and recommended a credit card or something. But using a card would leave streaks and wasn't very even. So that is what lead to me just using my finger (which isn't oily and I washed up before).

Later they changed the instructions to just putting a dot in the middle and letting the CPU heatsink spread it out. Which is certainly easier.