Well I have three choices on power really..
I have an OS LA 46 at home. This would really be a bit weak in my opinion. In fact I have yet to find a plane that this engine works well on.

I also have an MDS .48. This is a bit more powerful but I am hesitant to trust MDS engines.

Finally I am thinking of buying an Evolution Engine from H9. I have heard good things on this and it really is inexpensive.