Hi, I don’t use any actions, I’m too lazy to download stuff I just sharpen a little bit and then I play with the curves and stuff. There is a lot of cool actions/psds in tumblr though, you should check out chaoticresources their tumblr is very well organized, whenever I need something, I go there :) I hope you can find whatever you are looking for!
Edit: Alyssa | williamtates - who joined our blog a little while ago and makes the amazing gifs/edits we were posting lately, uses this action (x) along with smart sharpen!