Is the shake warning the only problem you're having? Because if that's the case then we can probably help you improve your technique. How old is the camera you have now? Cameras introduced in the last year have much better high ISO performance than older digital cameras. So a new camera will help you with motion blur and freezing action because you'll be able to get better image quality at higher ISO settings. And Michael's reply is right on target and pretty much addresses everything you mentioned. I am just wondering if there's more you're looking for. The more specific you are the more we can help.