I'm thinking about buying headlight protection for my GS, and IS, which brand would you guy's recommend Venture, Aeroshield, X-pel, Stoneguard?

most people here would probably recomend Aeroshield seeing as most members who got it got it through a GB

I've heard Venture is the clearest and most durable but it's probaly only by a slight margin. All the films are pretty good at protection. The main thing is to get some excess in case you mess up and apply it properly. Wetting the surface and film with a spraybottle of 50/50 alcohol/water works well to keep the film mobile and work out bubbles.