I managed 11 nights last year. I went a few times by myself and most of the trips were with the same person, so we kinda just hit everything really quickly and were able to do plenty of repeats a night. I did 130 houses, 7 B&T, 3 RHPS, and some rides on a few nights I went with friends who hadn't been to USF during the day before.
I'm attending opening weekend, closing Thurs-Sun, and most Wednesdays, Fridays, and Sundays in between. I actually have the opposite goal of Hate and Owen. This year I hope to meet up with some more people from here/Twitter/etc. and enjoy the event at a slightly more relaxed pace, instead of hauling ass to house after house all night.
Don't get me wrong, I'll still slide right past 100 houses no problem, and repeat the best house a BUNCH of times, but the final number won't be something I really care about at the end of the day. Either way, the event's gonna be amazing and I can't wait for it!
For fun, my house counts from last year were 25 for Dollhouse, 20 FDTD, 17 Roanoke (literally only because we got to go through house virtually alone everytime cuz it NEVER had a long line before 7 or 8 on busy nights), 17 Giggles, 16 AvP, 16 Halloween, 15 Drac, 10 TWD.
All without Express too, btw.