Looking for a DAC for the Squeezebox Touch

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.

Let me add that the whole battery power thing was accomplished using a $15 sealed lead acid battery and a $30 charger.