I've never actually seen MASH but I've heard it compared to Scrubs before. And Scrubs can go quite serious once in a while; there's one ep in s3 that made me outright cry, and there's a short arc in, umm, s5 I think, that I rewatched about half a dozen times (as a Cox fan I suspect you'll enjoy it, too ^^)

Yeah, I like Psych but I could use a wee bit more seriousness...(there's so much potential for more, and there's little tiny flashes that make my h/c'ers heart go pitter-pat, but it's frustrating...)