Hey Benjy,
that's the format I have: A80 RC 1/2" into the Korg DSD. It's pretty unbeatable.
If not using the DSD, I'd definitely take the 1/2" mixes to mastering. Regardless of sampling rate, you lose a lot once you send it into the computer. Really depressing.
I'm in town- you're welcome to drop by with some tracks and test it out for yourself. PM me.
David