The "champ" is probably something like Indigo Xtreme, followed closely by the elite TIMs like Gelid GC Extreme, Prolimatech PK-1, etc. MX-2 is a notch below but still very good and very cheap. AS5 is actually slightly worse than MX-2 (albeit still good), but it costs more than MX-2.
The stock HSF will indeed "work just fine" for file server duties... especially if the file server spends the vast majority of its time idling, like most home file servers. Intel TIM is not the best but it gets the job done, and for your specific case I don't know why you'd bother with anything different. I mean it's a mostly-idle file server....
Main: 3570K + R9 290 + 16GB 1866 + AsRock Extreme4 Z77 + Eyefinity 5760x1080 eIPS
Originally Posted by BoFox
We had to suffer polygonal boobs for a decade because of selfish corporate reasons.
Last edited by blastingcap; 11-02-2012 at 08:18 PM.