I've heard many DACs at $1k and under. Not all, but many. I chose the Rega DAC. It was easily the best DAC I've heard in that range. Contrary to what was said about it earlier, it does NOT have XLR - in or out. Someone in another thread mentioned high-res through USB. Doesn't do that either. It does high-res through coax and optical though.
I owned the Rega Apollo and looked for a $1k DAC that would beat it for a long time. No surprise that the Rega DAC does everything the Apollo did, but on a higher level across the board. I haven't owned a Saturn and didn't hear the DAC and Saturn side by side, but by all reports the DAC is equal to it. A little different, but equal in quality of sound.
The Rega DAC isn't the most detailed DAC out there. It won't knock down the walls and ceiling in soundstaging. It does an average to above average job with that stuff. What it does best is make sense out of music. Call it PRaT or whatever you will. Jimi Hendrix's Little Wing is a great song, but sonically it's a mess. Sounds jumbled and thrown together. Not so with the Rega DAC in my system. I had to listen to it 3 times in a row the first time I heard it through the DAC, because I've never heard it sound so good. The DAC sounds like a great turntable to my ears. Not some warmed over and overly smooth turntable, but a great turntable without the pops, clicks, and groove distortion.
The Benchmark DACs are excellent IMO. They just sound too thin, lean, and a bit bleached to my ears.
The Arcam rDAC is great for the money. I don't think there's any competition for it at it's price. But it's no where near as good as the Rega DAC. Heard them side by side when I bought the Rega. If my budget wouldn't go past the rDAC's price, I'd very happily own it. Far better than the DAC Magic and V-DAC IMO.
The Simaudio D100 is excellent too. I briefly heard it, so no long opinion of it. It didn't do anything wrong, and was very musical. Definitely worth looking into IMO.
Just some thoughts. I haven't heard any tube DACs. I stay far away from tubes, as my OCD wouldn't get along with constantly wanting to try new tubes and wonder how much tube life is left.