I would say that one of the best old H/L fics that really caught my attention was While You were Gone, by Stonedrose. It's a really great AU spin on the OT, and of Han and Leia's relationship. No matter what they went through in the story, and there was so much going on, the connection between them remained solid and you could believe it. The only sad thing about the story is that it was not completed. It's a really great, exciting H/L tale though, well worth a look. Anything by LadyPadme as well. Her characterizations are amazing.