Dac with volume control

I know this has been asked before, but im still trolling for ideas. My current system is itunes (applelossless) to an airport express straight into my b&k st202 amp and infinity Qe speakers. This amp/speaker combo works wonderfully and i have yet to hear anything i like more including some very expensive setups. I had a traditional setup before with a rotel front end that sounded great but wanted the simplicity, small size and ease of use of the computer based setup. I am looking for a dac with a volume to run between the airport and my amp. must accept toslink. Current ideas are Creek obh-14, monarchy 18b and birdland lite. budeget is preferably under $300. comments and suggestions welcome.