people might want to check out berg's lyric suite for string quartet. some good recordings of the work include the one by arditti quartet and one by kronos quartet. kronos quartet's recording is the first one to feature a soprano (dawn upshaw here) in the last movement. apparently berg had the intention to use a german translation of a poem by baudelaire, but this didn't make it to the final version. the person who made the discovery of what berg originally intended completed some of berg's unfinished manuscripts for the vocal score. it is at least interesting to have this version of the work as well. the combination of voice with string quartet of course brings to mind schoenberg's string quartet no.2, but i believe lyric suite may appeal to more people here.
i also recommend berg's string quartet op.3 and violin concerto ("to the memory of an angel"). the arditti quartet recording of the lyric suite also has the string quartet. a very good and moving recording of the concerto is by itzhak perlman with seiji ozawa conducting the boston symphony orchestra (this cd also features stravinsky's violin concerto and my favorite recording of ravel's marvelous tzigane).
deutsche grammophon has an 8 cd set of berg's complete works with excellent recordings for about 60 bucks. pretty nice.
i do have to say that i too am a little surprised that people here like wozzeck. i don't really find much interest in either lulu or wozzeck. my vinyl copies have been standing there unplayed for a very long time.