Wire/rod for homemade sway bars?

[simplechamp]

If I wanted to mess around with making some DIY sway bars, does anyone know what type of wire/rod I should use? Has anyone else made their own, and if so what did you use?

I have been looking at some suppliers online, but there are a ton of different types of steel and other alloys and I don't know what to use? I'd like to be able to bend it without heating, and have it retain shape, but if heating with a torch will work better I can do that too.