Okay, here's the deal; I'm sure this subject has been covered ad nauseum, but the more research I do the more confused I get. I've been a 1/2A pilot for a long time, but frankly I'm getting disgusted with dealing with the continual lousy design of them (nobody makes a truly modern 1/2A engine, and nobody seems to be willing to pay what such an engine would be worth). I know how to design an airframe sized to take a .049 glow engine, and now I'm wanting to go into electric. The subject is extremely confusing, so I need some hand-holding. From reading, I've determined I need to have around 100-125 watts, and I want to use a propeller no larger than 7 inches (this should keep things with the 1/2A range, right?). I've also determined that brushless is the way to go, and probably LiPo batteries for weight considerations.

Now, here is my question, and the bit that has me confused (and considering giving up on the whole mess). Surely there is a general, ballpark motor/battery combination that will work as a drop in replacement for a 1/2A engine...and suitable for everyday sport flying? I can't find my wizarding hat to make heads or tails of all this mystical, esoteric discussion.