I plan on getting the plane in the next few weeks and havent decided to go 4 stroke 160 twin,, or gas.. DLE 20? 30?
No plans for electric!

What has been the most popular engine installed?

If you're talking about the new one I heard that the Saito 1.25 works extremely well.

Just wanted some different ideas

I would go with the DLE 30. The DLE 20 would be sufficient but the 30 would be unlimited.

Is this the .90 sized Christen?

well its the 1.20 size from hangar 9 its a bit larger than the great planes one and smaller than the 1/3 scale size that GP came out with several years ago. AND gawd I wish they would come out with it again.

If operating cost is not a factor, the 160 glow twin is my favorite! You can also convert it to CDI ignition on glow for better running down the road.

Holy moly! That would be a LOT of motor for this plane.