i would say between Media Player Classic (lighter on resources vs KMPlayer but dont do nearly as much either) and The KMPlayer (overall better than Media Player Classic but dont load up as quick) your pretty much covered ... lately my video player of choice though overall is KMPlayer as everything "just works" although i noticed on some home videos i recorded on a home dvd recorder you generally cant skip forward in the videos to where you want and i noticed it wont play some of my .rmvb files.

i think players like PowerDVD and WinDVD are pretty much not worth using anymore since you can get FREE players that are generally just as good if not better in most cases.

p.s. VLC aint bad but the main reason i think KMplayer is MUCH better is cause on x264 (.mkv) files it has issues skipping forward with the slider bar vs kmplayer which has no problems.... plus KMplayer supports alot of video formats without needing additional codecs installed ... i also hear good things about GOM Player but my guess is GOM Player and KMPlayer are roughly the same one way or the other.

speaking of gom player im going to download it and give it a try