Well, I like the 4 bangers now, so that would be my choice. You'll give up several ounces, but the sound alone is worth that to me. Mine has a new Saito .72 (nothin against YS, just never had one) and it's very good. Plenty of power, bigger prop seems to make steadier hover/TR and did I mention the sound?

Bill and I both had .46 2S on them and they were just ducky too, so you can't really go wrong (well, unless you use that LA ) Bill has the webra .50 on his Sledge and it's really great (not as good as my Saito .91 but.........) You know, you might not want to listen to me..........They're coming to take me away!!!!!