My money's on Iron Rattler or Full Throttle, both of which, despite my slight distaste for their names, exceeded my expectations. I'm sure I'm underestimating it, but Outlaw Run just isn't getting me all hyped up. It looks like a good ride, yes, but I'm not frothing at the mouth over it and putting down Iron Rattler in comparison like people on several enthusiast sites. It's probably got something to do with my qualms on how they're classifying/marketing OR, but that's for another topic.
Still, like Browntggrr, I have yet to ride any of them and do lack Doc Brown's DeLorean, so I couldn't tell you which one will be the best. Still looks like a great year is coming up, and I'm glad to see California's Great America finally receiving a new coaster--and an impressive-looking GCI, at that.