Theta Pro Basic III, Bel Canto Dac2, CIAudio VDA-2

I have a dac dilemma. Putting together a stereo system for music streaming and CD playback. I have a budget of $600 for a dac that will be used with my Sonos and playing back CDs from a blu-ray player.

I have the opportunity of getting a Theta Pro Basic IIIa for $500 (MSRP $2800) or a Bel Canto Dac2 for $450 (MSRP $1300). Should I really consider these dacs if I can get a brand new CIAudio VDA-2 for $600? The Theta dac was one of the top performers in the mid-90s, and the Bel Canto was very popular in the early 2000s. I am hoping that someone can comment on their experiences with the Theta and Bel Canto, and how it compares with the current VDA-2?
Would also like to throw the PS Audio Digital Link III into the mix as well.
I really liked my VDA 2, it is a killer dac except it lacks features and only has 2 inputs. If you can live with that I don't think you'll be sorry. I would also consider the BelCanto but the Theta is too old and you are probably screwed if that needs service. I don't think the new ATI owned Theta supports the vintage gear.
Forget about the Theta. It is way too old to be competitive those days. Not to mention poor jitter rejection. Same for Bel Canto.

I would get sth more modern, like the new PS Audio NuWave DAC for example. You can get one used for ~$600 on AgoN or $800 brand new.