Looking back on it, towards a second read-through...
I can barely motivate myself to read NJO again. It's just too long, too dark, too depressing. I'm looking forward to re-reading Dark Nest and LOTF though. Aside from the last two books I enjoyed the hell out of those.
For the Bantam Era, I love to re-read the Zahn books, the Jedi Academy Trilogy, and the Origin of Han Solo Trilogy, but everything else is an absolute chore to go through a second time.