I don’t know of a Schubert quartet by that name, but Haydn’s string quartet Op. 76 No. 4 is nicknamed “The Sunrise.” After a little Googling, I learned there is a string quartet (i.e. a group of four musicians) named the Sunrise Quartet; perhaps they were the performers on what you heard?
Anyway, the Trout Quintet is Schubert’s greatest hit in the chamber music genre, and one of the most popular pieces of chamber music by anybody. He also wrote some popular string quartets (including the “Rosamunde” and “Death and the Maiden”), piano trios, and an octet.
Haydn wrote a lot of good string quartets. The six that make up his Opus 76 are probably considered his best, but personally, I like his Opus 64 quartets, especially No. 5 from that set (“The Lark”).
Another Chamber Music Greatest Hit is Dvorak’s “American” string quartet. It’s good, catchy stuff, but he also wrote a lot of other chamber music that’s well worth listening to.
I rather like Schumann’s piano quintet and piano quartet.
I second ErinPuff’s Faure and Poulenc suggestions.
If I had to pick a single favorite chamber work, I might go with Beethoven’s Archduke Trio. He wrote some other great chamber works, too; don’t neglect his violin sonatas. (Interestingly, one of them, the “Kreutzer Sonata,” inspired a story by Leo Tolstoy, which in turn inspired a string quartet by Janacek.)