Foobar 2000 or MediaMonkey v.3?

My PC runs Windows XP 2000 w/ Service Pack 3. My music library, so far, contains tracks dowloaded from Amazon.com. My audio player is WMP.

Audio out is via Behringer U-Control (dedicated USB cable, 16/48 DAC); RCA's from Behringer to Parasound pre (analog inputs only, no internal DAC) to NAD amp. I will soon upgrade from the Behringer to an Edirol UA-1 EX (24/96). I'd love to get something like a used Bel Canto DAC, but do not have the bucks.

I'm wondering if Foobar 2000 or Media Monkey will afford better sound than the WMP. I don't care about all the bells and whistles - just the sound. If yes, which is better - Foobar or Media Monkey? Where does J River fit in?

If I download one of these, should I also get ASIO and/or Kernel Streaming?

Thank you. Mike19