As Robo56 said, RIP is a fantastic option for all the reasons stated. 2 slight negatives to the tour: last year we didn't get to see the Academy of Villains show and we basically just walked through the scare zones. Having said that, after the tour ended, we could have went back through the zones again if we wanted. There might have even been another AoV show after the tour, but I'm thinking there wasn't the night we had the tour.
Personally, if I was going your 3 nights, I think I'd get the Rush of Fear + Express Pass for $300 + tax each. We like to take our time and tour at a leisure pace stopping in the zones and snacks and drinks. And unless I just absolutely don't like a house (e.g. Run), I want to go through each house every night.