From your list, i have not heard the K 601. From the cans I know, Shure SRH 840 and KRK KNS 8400 are the best. The Shure has a mid bass hump and somewhat recessed highs. The KRK has less bass; is brighter and more balanced overall. Closed cans, especially in this price range, are not going give you much sound stage. They are good left to right (separation).
Ok, which would be more comfortable - I have a medium sized head and wear glasses when gaming? (And I kind of gathered from reviews that most closed cans don't do sound stage well, that seems something that open and semi-open cans do much better).