I've never been to Undercaste but I've heard some of the albums that came out of there and the sound quality on all of them is A-1.
Big Boy studios and The D-Sane Asylum are the top 2 studios I have been to. You can't go wrong at either spot.
I'm sure there are others but in my opinion these have the cleanest sound of places I've recorded. The engineer has a lot to do with it too.
My studio is very nice... I have two different systems, a cubase system and a Pro Tools HD Accel system, both with the cleanest signal paths you'll find. If you need time or want to collab with any folks on UTR, hit me on the PM. It's nothing.