Truth be told, I haven't found that one player I really love. If I could mix Winamp with Doubletwist, I'd have my perfect player... DT doesn't have very good playlist support and Winamp is clunky, but I love the feel of DT.
Voodoo is really similar to CM's DSP Manager and is a more customizable version of BeatsAudio; I honestly don't know if Voodoo works with the S3, but DSP manager does. The both offer compression and EQ control, so if you have low-quality MP3s, they'll sound better than stock sound will make them. If you have a music app like Poweramp or Doubletwist, you don't need to use the EQ control in Voodoo, so what's left is just the compression feature. Personally, I stay away from compression apps/mods like the plague, because they end up altering the sound of the file and, IMO, if it's a properly mastered file/recording, you don't need compression (except for maybe some tube compression on a standalone amp for some 'warmer' sound... but that's not applicable here).
I stick to using EQ controls in the players apps. If you try that and just don't find they offer you the sound you want, then try an app like Voodoo. But be forewarned, I've seen (and experienced) some issues on other devices where apps like that can alter the audio framework of the rom permanently, so even after you uninstall it, the sound remains affected.