All good ideas. I can't get really excited about SPAD and coroplast planes. I've flown a SPAD in the past, and it was neat, but not my usuall "flavor"
The Fun 51 and the Lazy Tiger are good ideas. I've done the Fazer already.
I like the Great Planes T-Craft. Kinda reminds me of a Decathlon or a Clipped Cub.
I could always get another engine and build the GP P-38 profile