I've helped a friend setup and test fly his OS 120 Surpass powered GP Tiger Moth and rate it very highly. Nice, easy flying bird that looks very realistic in the air and lands at a crawl.

If your a fan of period bipes and want a relaxed Sunday type flyer, you can't go wrong w/ the Moth. The reason my friend went w/ the 120, is that his plane required a ton of nose weight with a Saito 91, so he just put the extra weight to good use in the form of a bigger/heavier engine. After 30+ flights the airframe is still in good shape and seems to handle the extra power w/ ease.