ORIGINAL: DarZeelon
Jerome,
You can consider [link=http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8988]the ASP S.61A[/link] from HobbyKing.
It is a full-size .61 engine and has a .91 version in the same frame, for not much more from other outlets.
If you think the power of the OS.55AX is enough for your needs, consider [link=http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8989]the ASP S.52A[/link].
It is true ABC, and will likely last longer than any ABN engine.
...And it costs just $50; roughly one third of the other choices you mentioned.
Good to see you say that about the ASP s52a Darzeelon... I unpacked mine last night
