Swing Set Plans Rapidshare What's The Best Choice For A Swing Set? Metal, Wood Or Plastic?

What's the best choice for a swing set? Metal, wood or plastic? - swing set plans rapidshare

Looking to buy a swing for my niece and cousins, but I do not know what. I live in an area that rains a lot, but it's hot in the summer. I want to be able to play on her all year. If I get one in a forest, I have to worry about splinters? A metal will get rust or sharp edges? A plastic will crack and break?

Thank you,
Ashley =.)