Luke, the Saito 150 should be fine. Looking in the tachometer forum, it gives about the same readings as my YS 120, which I plan to use.

Having said that though, the engine I would get if going new is the new YS 140 FZ sport. I doubt it would be more than the 150, probably even less. Drop Archie and Probuild an email to find out. Only down side is you will need another fuel as the 10% formular irvine you use will be really pushing it - contains castor and is a bit too low on nitro. Oh and you would need a proper pipe to get the noise down to EMC levels.

In the long term, I plan on getting the 140, and using the 120 in something else.