I was all ready to get a PS Audio Sprout as my solution for a compact integrated amplifier to connect my Technics SL-QL1 (MM, no preamp) record player and Airport Express (MC414LL/A) to my Wharfedale Denton 80th Anniversary speakers, when I noticed the Sprout doesn't have an optical S/PDIF input, only a coax. So what do I do? 1. Use the supposedly pretty good DAC in the Airport Express and connect it to an analog input on the Sprout? 2. Use the DAC in the Sprout by connecting the Airport Express through an optical to coax adapter? Are there even reasonable optical to coax adapters out there? Do they introduce any delay or decay in sound quality? 3. Something else?