I have a Beeman R1 in 20 cal., with a 4x32 scope on it, and love it, even with the barrel cocking action. The 20 cal. is awesome on most anything, still shoots real flat, yet hits A LOT harder. I use it to shoot pigeons (a.k.a flying rats) at my in-laws farm. I can shoot the pigeons off of the top of a very tall silo with no problems. Have also killed several other varmints around the neighborhood.
I also have a question for you airgunners out there, what would you guys recommend for 7 year-old for a first air rifle? He will always be with me when using it, but I want something he can use without worrying about a very expensive rifle like my R1, but I want it to fit him as well?