For those saying Aerotech and Quest haven't put out new kits in years:
I always thought Aerotech put number one priority in their Motors. In the past 25 years or so their rocket lineup hasn't changed much, that being said I'm probably going to buy another Imitator kit from them. That's probably one of the best rockets ever made.
I don't know to much about Quest for me personally Estes always appealed to me more so I may have only bought one or two quest kits ever, the one I really do like is the Quadrunner from them and I might order that one soon, but its similar to Aerotech Imitator, I might just get an Imitator and modify the motor mount to a 4 x 18mm cluster.