If I'm not mistaken, Theta digital sources have healthy output voltages.
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It's not as important to have high output voltage as it is too have output voltage and impedance that match the input specs of the amp. You'll probably want something with a good analog (not digital) volume control on the CD, or an amp with volume controls. Or, a passive volume control between the CD and amp works well also.
The CAL Audio Sigma II has a really high output voltage (obnoxiously so, in fact). One can be had very cheaply on Audiogon, and, it actually sounds darn good because of the tubed output stage. My primary DAC is a Levinson 360s, and to be honest, the CAL is, on the whole, competitive because it is so musical (especially if you use it with really good interconnects). For whatever it's worth, one of the Stereophile reviewers used one up until very recently. If you buy one, leave it on 24 hours a day (mine has been on pretty much constantly for eight years and sounds better than ever -- I've never even had to replace the tube).