Looking for a DAC for the Squeezebox Touch

I run the W4S DAC2 with my SBT with great results...

From your responses it appears the power supply is the way to start. I'll look into both the Welborne and the Bolder for prices. I know DACs sound different and I guess it depends on my taste in sound quality. I looking for a DAC that will have a tight bass response and smooth highs. I listen to variety of music from jazz, classical and rock. Most often rock recording aren't that great especially on CDs. I'm not sure if a DAC will help the sound quality on these recordings.

FWIW, I'm also looking for a DAC to pair with my Touch, and my top list includes W4S DAC2, Bryston BDA-1, and possibly Burson DA-160 (to be released soon). All three have discrete analog sections. A couple forum members tried the DAC2 and BDA1 in their systems and preferred the BDA1. A used BDA1 sells for about $1600, close to DAC2.
Hopefully Burson's DAC is a good contender.

Also, have you checked Soundchekk's toolbox to improve on the Touch's sound? These are mostly software options you can set up yourself: will cost you nothing, and is likely to improve sound.

I'm running a Musical Fidelity V-DAC (battery powered) with my Squeezebox v3. Sounds pretty darn good to me.

Ronrags: as you look into power upgrades for the Touch, don't overlook the battery-power alternatives for it.