How to choose a DAC?

I'd suggest auditioning what is currently reputed for excellent jitter immunity and then pick what you prefer the sound of.

The main thing of course is how the units sound. I wouldn't focus on jitter because by definition a DAC with a lot of jitter is going to sound crappy.

Agreed. A jittery DAC will sound crap.

However, you need to be aware that some DAC's require a clean low jitter incoming signal whilst others can handle large amounts of incoming jitter on the digital interface. In practice this means that a nice sounding DAC with poor jitter rejection may require a reclocker to perform optimally.