The RCA outputs on the Benchmark are fine. I'm not familiar with Audio Space, but don't go by that, I do like the CAT a lot though.
I'm not sure of your budget, however, I would also like to add; VTL 5.5, Atma-Sphere MP-3, Joule Electra LA150, Aesthetix Saturn Calypso, PrimaLuna ProLogue3, and Rogue Audio Metis to your list. Some are more costly than others, but at least this list will give you a good starting point.
I haven't listened to many of these, but they have all received wonderful accolades and awards from TAS and Stereophile alike.
Rich
I'm not sure of your budget, however, I would also like to add; VTL 5.5, Atma-Sphere MP-3, Joule Electra LA150, Aesthetix Saturn Calypso, PrimaLuna ProLogue3, and Rogue Audio Metis to your list. Some are more costly than others, but at least this list will give you a good starting point.
I haven't listened to many of these, but they have all received wonderful accolades and awards from TAS and Stereophile alike.
Rich