The Electric MicroAero Cub might be a good starter, as it is the only one of the four kits you mentioned that has ailerons (based on what I saw, anyway). The LT40 is really easy flying though, and will be much less influenced by moderate breezes while flying. Larger is usually easier, since larger models handle more consistently and are easier to see while flying than smaller models.

Still, if you'd prefer to start out small, the Electric MicroAero Cub should provide you with a very good small-scale version of your LT-40 to fly. You might also consider simply building a Kadet LT-25 kit and converting it to electric power or simply flying it with a glow .25 engine if you think smaller will be better. Just a thought.

Edit: Oops, had another thought. Hobbico makes a plane called the Superstar EP as an ARF or RTF plane. Either version with ailerons would also be a good electric starter if you want to fly your LT-40 later. If you buy a RTF Superstar EP, you could use the included 4-channel transmitter with your LT-40 down the road.