+1 PotPlayer.

Developed by the same guy that made KMPlayer. PotPlayer is extremely robust and offers a lot of advanced settings, if that's your thing.

MPV ... or MPC-HC + madVR

BS Player (cracked Pro version of course)
and VLC for anything that doesn't play on BS Player (rare)

VLC, haven't really looked into other/new players since i started using it.

I stream everything through Plex these days. Does the trick on the home AV systems, and even downgraded quality is barely noticeable once you get into a movie remotely; I tend to stop looking at the quality unless it severely dips.

BUT, when in the need, VLC always.

I manage all my media through Plex (Media Server/Player/App). But for somethings like playing my old ripped ISOs I still use VLC.

PowerDVD 15

Vlc. Guess a majority of us here are a fan of them.

Klite Codec Pack

normally i prefer to just use my plex server but i also have VLC player and sometimes i use windows media player