Looking for a DAC with balanced line-outs

[Dirtyworks]

Hi, I picked up a pair of Adam F7's (speakers) on Boxing Day, and though my ODAC is pretty awesome, I'd like to find a DAC with balanced line outs. Alternatively, how much trouble would it be to add balanced outs to an ODAC?

I have both XLR and 1/4 TRS balanced connections (also have RCA non-balanced).

EDIT: I've found the Midiman Flying Cow?

I've decided to modify my ODAC and add a unbalanced -> balanced converter. I'm between the ART CleanBoxPro and the Rolls MB18B. Which of these two is the better unit?