It doesn't matter what you use as long as it's up to date and is not VLC. CCCP, K-Lite, Shark007, and KCP all work with .mkv files using most of (if not all) the same standard parts so you can even set it up yourself without using a pack made for casuals and get similar results.
The guides are outdated, but the information about Hi10P and the basic components, MPC-HC (Player) + LAV Filters (Splitter, Video, Audio) + xy-VSFilter (Subtitles) + madVR (Renderer), used most commonly aren't.
AzureHakua's "MPC-HC + LAV Filters + xy-VSFilter + madVR Guide" - Alternative to the first guide in case of prefering VSFilter instead of ISR.
The Anime Lounge Sticky - Downloading anime and manga by IRC.
imouto.my Blog Post - Watching h.264 videos with DXVA. Warning: the site is a clusterfuck.
imouto.my Blog Post - Watching h.264 videos with CUDA. Also has options for software decoding, DXVA and Intel QuickSync.
MangaUpdates RSS - RSS feed to keep up to date with the latest translated chapters of the manga you are reading.