I know nothing about string quartets but having listened to the recommendations in the side bar I am now totally hooked. I would love some more recommendations.

So I have worked my way through everything in this post at least once and some of them many times now. I am completely in love with Bartok and also very much like the Shostakovich I have listened to. I know nothing about string quartets but have been completely blown away by these two composers and am thirsty for more. I would really appreciate some guidance.