Cody,
The 100cc should fly the plane fine. The Barth kit builds lighter than the AMR. Check the weight on the plane when you get it. My AMR is sitting at 60 lbs. I have a 3W-157 and it is plenty of power. I am interested in seeing how much your plane weighs.
When you build your AMR you need to put the tail on a diet. I removed approx. 9 oz from the tail and still had to add 3-4 lbs of weight to the engine box. If I were to build another one I would put the elevator servo's in the fuse behind the cockpits and save some more weight.
Later!!
Anthony