If you're going to Stay and Scream the first houses to open are Wolfman and Dracula. When you finish them I would head over to either Saw or Chucky, because they are popular and get crowded fast. By the time you get out of them all the houses will be open. If you choose to do Saw the closest houses when you get out are Spawning or Leave It To Cleaver. If you chose Chucky then it would be Silent Scream, Spawning then Saw but you have to be careful not to run into the crowd leaving Bill and Ted's Excellent Halloween Adventure. Frankenstein gets lost in the shuffle, it is actually closest to Wolfman and Dracula but it doesn't open until 6:30 so you could either spend the time waiting or walking to a house further away. I would read the threads that rate the houses, it may help you with a strategy.
These times could also be different now because the first 2 weeks had AP events so some houses were open earlier than usual. For instance, on opening day Chucky opened at about 5pm and Silent Scream was next so if you came out of S&S expecting to be in front you would have seen huge lines at those houses.