Thank You Summerwind and Custom PC for your input. I found this website for Saito engines and a good price for the Saito 100, don't you think?. http://www.rcslot.com/pc-radio-contr...SAIE100GK.html

As far as responsiveness however I have no experience with a 4 stroke with a pump or without a pump. Does the pump make that much of a difference? I have 2 OS engines and they run so sweet, but I like the look of the Golden Knight too.