This has been asked a lot of times before. Generally everyone recommends these planes:

1. The Great Planes Venus 40

2. If you have a Swallow why not get a Lark 70? Its a smaller version of your plane.

3. The Hanger 9 Aresti 40 is a nice plane too.

All of the above use a .46 2S or a .63-.72 4s. If you want to fly precision use the above motors. More sport flying oriented guys are putting in .61 2c engines and boring holes on the sky.

Models smaller than these just do not track well. Look into .40 size plus planes.