Why not default Windows Media Player that comes built in Windows 7/8?
Use some separate tagging software like Tag&Rename (Paid but worth it) to organize and clean the tags.
iTunes sucks because it cannot "Watch" your MP3 collection folder for any changes you make to tags or file names. WMP 11/12 does that on the fly.
Not to mention few idiotic services which get installed forcefully along with iTunes. If you do not have any iDevice then there is no point in using iTunes apart from occasionally buying legit music.
Winamp as a music player must retire. It's antiquated technology with equally outdated default interface which no skinning can compensate.
J River Media Center is an unnecessary paid bloated music player.
The behind the scenes library management of WMP 11/12 is miles ahead of competition. I am not an audiophile who describes music like some sommelier. But still I personally think WMP music quality is superior to iTunes and J River Media Center on Grado SR-325is head phones.
But the best part of WMP as you know it, its free and native.