That was the The Heir to the Empire trilogy; Heir to the Empire, Dark Force Rising and The Last Command. I could be wrong about this, but I'm fairly sure that Heir to the Empire was the first book in the EU.
Those are the ones, I wouldn't mind seeing them as films. Except for the fact that there would have to be different actors, and knowing Disney we'd get Zac Efron as Luke Skywalker.
From the Story Arch of the Expanded Universe, the two main threads are New Republic and the New Jedi Order. These stories are all but separate, each existing as a standalone with Luke's adventures and Leia's adventures being followed separately. There some overlap between them two of them, but to choose which of them, or which parts would be part of Episodes 7, 8 and 9 would be a challenge. How do you choose the stories of the New Republic and the New Jedi Order? Both would be important, but one can be ignored at the expense of the other. To try to combine those would make for an unwieldy or unsatisfying movie.
They did say they plan on releasing them every other year, so they could alternate, releasing a new republic film in 2015 and then a new jedi order film in 2016 and only having a semi-overlapping cast so that it isn't too much of a workload for any one actor.