I am running a Saito 150 in my Showtime... Performance rocks, unlimited vertical and it pulls out of a hover with no questions asked. I had to shave the inside of the engine mounts to fit the crank case between them while still using the stock blind nuts in the firewall. CG was not a issue, I mounted the rudder servo in the tail and I have the tank and battery on the wing tube. Get the 150 for sure dude, you will be happy you did!