Hi. One post by tideflyer asked about the Avistar. I would like to buy an Avistar ARF as a second plane (first plane is Superstar electric w/3 channel radio). I also need a 4 channel radio with buddy system, so this would work for me. This ARF comes with a .40 LA. Is this a dependable engine or should upgrade to something else? One gent told me to look at the Tower traner ARF w/ Tower ballbearing engine. What do you guys think?? Thanks, Mike