I am seriously considering the dark urge for my first playthrough as I am far more inclined to walk the darker paths first. But I will try to keep at least some companions alive...at least Shadowheart and Minthara. But for class I think Paladin is a bad choice unless you intentionally plan to become an oathbreaker as following the dark urge will almost certainly land you as an oathbreaker.

For class I plan to first play as a Warlock as I want a charisma driven character so I can have large bonuses in all charisma based speech checks and I am interested in seeing what interactions a warlock can have with his patron.