SB Touch through coax or USB to DAC?

I own a Touch and need to decide about a DAC: select one where the budget has been spent on optimizing the coax input (using the Touch coax out), or select an asynch USB DAC and perform the John Swenson mods to get the Touch to output thru the USB? It seems to be an either/or question in terms of DACs. Some have very good reviews about S/PDIF inputs (eg, Bryston, Rega), while other focus on asynch USB (Wyred DAC2, Calyx, Young, Wavelength, Ayre).

I'm confused.

Anybody has been able to try both options with the Touch?