I have been waiting to see the new gas Saito engine but so far haven't found anyone willing to spend that kind of money for that engine. Like Chuck mentions, there are just too many tried and true gassers out there and they cost a bunch less. The CRRC has been prooving itself in the field and there are several of the DLE engines showing up at the field now, so far it looks like a winner, the 55 has been great.
If you go into the gas engine forum you can read up on most any of the engines and see what kinds of problems some people are having with the different engines. There are just a lot of really good engines to choose from these days. I have never seen anyone go wrong with a DA but it's a high end engine but worth the price in the long run.