You asked about four strokes but I have to agree with TRU and Chuck, the DLE is a great engine and you can't beat the price and much cheaper to operate and very user friendly.
Magnums are hit or miss, you either get a good one or a piece of junk. I don't even keep them when I get them in a trade. Hobby King is the best place for prices and has express shipping but you do loose the service so Tower may be the best place to look. Very simple engines to operate.With the price of glow fuel I have seen a big shift to gas and DLE is the hot ticket these days. Check them out. Gas is also easier to set up too. The engine doesn't care where you put the tank.