I would suggest a KUL as a good alternative. Very solidly built boards, although I suppose that you would have to be okay with a TKL layout. Up to you, but I definitely think that KUL deserves a look.
As for whether or not the quality has lowered, I'm not entirely sure. I owned a Das4 for a while, but that was literally within a week of when they came out, so I can't really speak to their recent quality changes, if there have been any.