Yeah, I think I might just go with the .46 LA. It's not too much more expensive, and has a little more power without being any different in size or weight than the .40 LA. By the way, how big of a difference would I notice between the .40 and .46 LA?

The .46 FX or the new AX would be great - but I still have club dues and a radio to purchase... not to mention a flight box and flight line accessories! It would definitely be a good investment for a future plane.. but like I said, I'd still like to keep and fly my trainer without having to switch engines.