If funds are an issue and even if they aren't I would vote for the TT PRO46. It can be had for about 74 dollars at Quantum Models . I truly believe these engines are every bit as good and as powerful as the 46fx. I currently have 4 of them in use and one FX, I will also be putting one on my Youngest sons LT40 once I get it built.

My 2 cents worth.