I'm with lethal, if your thinking racing stripes. I drive a 96 GT vert, and I've looked at stripes, even mocked up a couple in photoshop, but I just don't think it works. However, if you are going to do it, I'd say basic black. With the top down it will be pretty nice, and it won't look to bad with the top up. My personal suggestion would be some slick rocker stripes, though. They can add that "muscle" look of racing stripes, without having to work around the top to much.
And btw, welcome. You might want to introduce yourself in the new member section, and some pics of your car would help with some more suggestions.