I know that engines get a lot of opinions voiced here and it's hard to pick if you are new because opinions are like a**-holes....everyone's got one. If you are teaming up with a club in your area you might get some opinions there. I don't know of one bad opinion I've read in this thread yet..........well maybe one. I'll go along with OS being top choice. I've flown mostly OS since 1979 and I've had a few....and still have a couple....of the LA series and they are good. I have a pair on a twin that I fly and have never had trouble. I still have one SuperTigre 75 in a warbird that I have and it is still ticking and a friend of mine finally sold a ST90 because he just couldn't wear it out. All of that being said, I've recently bought a couple of Magnum engines because they are priced right (a .46 costs $79.99) and a lot of people that I fly with just love them. I also have a friend that I met here on RCU that bought a couple of Magnums used and he swears that they just fly and fly and fly with absolutely no trouble. I'm not looking for bragging rights but the best bang for the buck and that's why I'm trying Magnums and I understand that their customer service is just great. Like all things........if you have a bad experience with something........even a top dollar item.......it tends to cloud your objective ability. Like I said early on.......I've flown mostly OS but I'm trying something different and hopefully it will prove to be a good choice. Whatever you decide.....let us know and keep us posted on your build.......OH the next big round of opinions will be what radio you should go with............LOOK OUT!!!!