There's a Bel Canto DAC3.5VB for sale here now in your price range. I had the DAC3VB in my system, and its imaging and soundstaging were outstanding (although it did everything well), which is why I'm recommending the 3.5VB for you in particular. If I were you I'd buy it, and if it doesn't absolutely blow away your W4S just resell it. I'd bet big bucks you won't, and if I could've afforded it I'd still have the DAC3VB in my system today. At the very least you'll have a reference for how your DAC compares to one of the better DACs out there. And no, it doesn't do DSD. Best of luck.