If you have no plans to hover it, the .61 will probably have enough beans for you. One option you might try if there is enough room (not familiar with the 40 sized US) is to put the elevator and rudder servos in the tail. Put the rudder servo just in front of the fin and the elevator servo just in front of the stab, centering both. Pretty much what you do is cut a hole big enough for the servo to sit in and reinforce with some 1/16" plywood. You can CA it into the inside of the fuse, just takes some finagling. Check out Ultra Stick 60 mods on this forum for how guys have done it. I did this with my US60 and it saved me from adding a lot of weight. Makes the controls more positive also. A win/win situation! You can also modify for a pull pull setup on both servos but I didnt do this.
Screw the guys that bag on you for not building, by the way. As you said, not everyone has time to build. I prefer to fly than build and have several ARF's. I do build some kits, however, either because a plane I am interested only comes in kit form or just because I want to build something.
I have a Kadet Senior ARF that I purchased for a video platform since I was interested in the video more than the plane and just wanted something quick to assemble and get in the air.
I also have a Ultra Stick 60 ARF merely because they are just so darned fun to fly. I figure to destroy it one of these days when I make an oops. I wouldnt fly it the way I do if I had spent months building it, believe me!