Replying to Colour Correction

So I finally got a real computer I can edit on. Im using final cut pro and am just wondering what is best to use for colour correction? I was thinking about magic bullet looks, and maybe colourista if I could find a download. I also have after effects but just got it today so havn't had a chance to use it yet although i know it can be used to colour correct as well. What do you guys use? And when should I colour correct/add a tint, before I bring the clips into final cut pro? Seperatly in final cut pro? Although I'm pretty sure you can't do that with after effects. Or do I do it all after I'm done putting the edit together?