If price doesn't matter, why not the new O.S. .46 AX? I would say that it would be the best bet of them all! I've had the FX and it was the best .46 I've ever had. It's just as powerful as my 0.61!!! for a little less weight. If money is no object, why would even consider Magnum and Tower? They are budget engines!

And... in terms of non-beginner .46, there are tons of them that are even better and much much more expensive. If you are talking about a good .46 engine with good power and easy to use, then the .46AX is golden, if you are looking for something you want to go pylon racing in, then there are better (more expensive) choices