Not sure if it has been mentioned (it very likely has), but I like Splinter of the Minds Eye.

It shows Luke fighting Vader, before he fought Vader (hipster Luke???) and Luke's lightsaber worked underwater somehow, and I liked the introduction to Force-artifacts with the Kaiburr Crystal.

There was another one that I enjoyed. It had Leia with yellow lightsaber on the cover, and the novel had something about her killing a Hutt that's all I recall. read that when I was 12/13

Anyone know which novel this is?