The .46 FX w/ Pre-tuned pipe should be able to get you more speed than the Saito. You should be able to turn a 10x7 APC around 14,000 RPMs. This should really make it scoot, and keep your weight down, so the addition of the camera, servo, etc., won't matter so much. You should have less trouble balancing, so you probably won't have to add more or as much weight to achieve balance. Less weight=better flight characteristics. I picked up an Aresti, and I am planning on putting this engine/pipe combo in it. Won't be done for a while. Everyone I have talked to though said that this should be a great combination.