I first started out using the AS-5 long time ago but after a short while I switched to the MX-4 because I like it better
Gelid Solutions GC-Extreme or Noctua NT-H1 for my important builds. MX-4 for everything else, spreads very nice.
Arctic Silver 5 for me .... works well , dramatic improvement in temps ! I know there are more expensive ones aimed at heavy gamers and over-clockers , but that's not me. It tastes nice as well , and gets your teeth white
Lol @ Joe. Arctic Silver 5 is all I use. I go through 12g every 1-2 months. I have tons of that silica paste stuff that came free with heatsinks, but it makes such a mess.