I'm not sure... but I think the only engine there that is current is the Magnum. I know the TT 42 isn't current and I'm pretty sure the 65 isn't as well. Personally, I'd go with the Saito only because it is a nice engine and you don't seem to really care about the price... but I'm sure no powerhouse. If you're not on a budget, the Saito is the way to go. If you are, then the Magnum shouldn't be bad.