media player classic + Klite Mega codec pack + Fraps… but i have watched only 720p movies till now…never tried 1080p coz i have a 6200 card only and my proc is a old P4 2.40 Ghz…i call it iron box 
WMP11 + CoreAVC + Haali media splitter + AC3Filter !
- XviD codec for mpeg4 content
These are the only codecs i have installed
… for rest of the files … vlc will do!
Gom player for nearly every video file with Klite Megacodec pack.