They're often considered the best in that price range, although I've seen some people make their case for the Shure 840. If you want some deep (but not overwhelming) bass, the M50s are probably what you're looking for.
SR60s are great but I find them to be better suited for stuff like rock (sharp highs so they can be very aggressive sounding, and they don't have as much soundstage as others).
The M50s are a closed design, but I don't think their sound isolation is that great since I can often still hear them when placed a few feet away from me. Still a lot better in that regard compared to the SR60 because EVERYONE will basically hear what you're hearing at almost the same volume you're experiencing them; they're not meant for public use at all. I do have to say that I've seen some people with the M50s in public and couldn't hear what they were listening to, so maybe it's just me.