What player do you use to watch movies through?

I use MPC-HC because of the better picture quality and more customizability. I prefer it's interface, too.

VLC media player

Kmplayer :)

power dvd
potplayer

VLC Media Player

I seem to always return to ZoomPlayer no matter what else I try.
VLC sometines for it's portability and no need for system codecs.

I use VLC Media Player. Works on Windows and linux

XBMC and Powerdvd 13

VLC. So simple, yet so useful!

KMPlayer