Derekmac, Great and thank you for the reply. There are no right and wrong choices of course, actually I encourage all my student to try everything as much as possible and its all about being the complete well rounded pilot, thats a great thing.
One thing that bothers me all to often though is when new folks (and I do realise you are not new) who have yet to learn to fly or even just assemble an arf want to start out by converting some glow plane to electric. This without any idea of the various challanges and pitfalls that may be present. This seldom works and usually turns into a money hole.
I wish you well in your efforts and since three different glow engines were in your choices I gave my opinion and which one actually would be superb in that airplane.
John