The Benchmark DAC2 used on A'Gon is a great choice. It maybe just as good as the DAC3, at least that was the opinion of the sales guy at Benchmark. I had the DAC2 updated with the latest upgrade and the sales guy at Benchmark told me not to waste money and buy the DAC3.
The DAC2 has 2 analog inputs (I have 2 tuners) and lot of digital inputs. I think Benchmark were the trail blazers with this type of pre-amp and now there are a lot of competitors with comparable units. The used DAC2 on A'Gon is an amazing deal and highly recommend by me.