MediaMonkey Gold... so currently it is MM4.2.x with WASAPI output on Win7 x64, for DSP it is Winamp VST Bridge and Electri-Q (which has up to 64 band EQ (I tend to stick with 5) with Frequency, Bandwidth (or Q), and Gain) for my VST EQ plugin. It makes it easy to match custom headphone equalizations between Rockbox on DAPs and on MediaMonkey (or if I feel like using Foobar, or XMPlay) I can still use Electri-Q. (Sigh, Isone Pro is pricey, and I haven't bit that hook yet).
Anyhow, I'm a FLAC format user mainly, MP3 320kbps otherwise, and I'll settle for an M4A if I have to (bc of the iTunes Store being the only outlet for the music), but Foobar (WASAPI and MediaMonkey4 (WASAPI) serve my needs best. I feel like the SQ or clarity is somewhat slightly improved with MM4, over Foobar, no "scientific" "tests" conducted.
Have used: iTunes, WMP10, 11, 12, WinAmp, Foobar, MPD (linux), Sonata (linux), JRiver Media Center, XMPlay, MediaMonkey 3, and 4. Out of those the only ones that sound good and aren't irritating to use are Foobar, XMPlay, and MM4. However, Foobar and esp. XMPlay are tiresome and irritating to tweak and configure for _me_.
Really liked the SQ of XMPlay, perhaps more than MM4, but hate the setup. I agree with the one poster who said JRiver had everything there, but it was annoying with the amount of steps/clicks to accomplish just one simple thing. It's "slick" but cumbersome. It's too bad really, if they streamlined JRiver I might switch.
Leaving, for all of the above reasons, MM4 for me. Though it would be prudent of them to construct a built-in VST host in the near future, so WinAmp plugins are no-longer "hackishly" necessary.
Enjoy the Music!

Edited by FLACvest - 2/29/12 at 12:39am