Considering it's AvPG and your 100th Episode, I imagine you'd want to cover both creatures.
How about you three discuss your favorite moments from every Alien, Predator and AvP film. And don't forget Predator 2 like you did with Paxton!
Or how about a double-feature? Two 30-45 Min interviews back-to-back in the same podcast with someone from Alien and someone from Predator? There might be a Lost Predator willing to be interviewed!