Now to make it more fun ... if money is NO issue then go for the Saito 82 ... that baby will throw a 14x6 prop! Want speed? Let's go for a Rossi 53 ... Got even more money? Try a JETT 76L, big bore engine in a small case (like OS46) but with major capital outlay. See how fun this hobby is? Hehehe ...

Cost effective engines would be your TT46 or MVVS49. They are definately value for money. The ST51 is pretty decent too for its price. Not tried the Evo but seen the 46 run, looks mighty fine.