Your combo choice is a good one. It will work well with your LT 40 as well as a lot of other planes. As for the debate on digital verse's the others, there are 2 sides to every story. I have used them and the only difference that I have noticed is the the digital need a little larger battery pack as they seem to pull more power than regular servos. I think they may have a solid purpose in larger planes, but for sport models, I have not noticed any difference in flight. Good Luck, Dave