It was a close-up between Quest and NPC, but I chose the Quest-Mod in the end. There are many great NPCs out there but there's only so many times I can play the game without needing a break. So I would love to see some new quests, especially when they also add dialog/character to the Bioware-NPCs.
And, of course, there is also an obvious approach: a group of young and eager adventurers is going to research the paths of the Bhaalspawn wars.
Is there a chance for them to meet some of the original NPCs? Because IMO it would be fun to meet the old crew and listen to their versions of the events