The big advantage to EI over mag engines is weight, ease of starting, and smoothness. The Fugi, Zenoah and other mag engines generally are quite heavy for their displacement and the larger sizes really dance around at low RPM. There are advantages as you do not have an extra battery to maintain and a magneto rarely goes bad.

At this time there are lots and lots of choices at very attractive prices. Best to read as much as you can and decide for yourself as to which brand suits your budget. If budget is not an issue, then it is hard to beat a DA or 3W or my personal favorite a Taurus. I had an Evolution 45 that was great for the size and power, but it too, was kind of pricey. As stated earlier, some of the smaller planes may do OK with a small gas engine althought you may have part of the engine sticking out of the cowl. (That may or may not bother you). If it is an aerobatic plane you wish, then a good rule of thumb is an 80" wingspan is good for about a 50cc (3.2) engine.