go to tigeowners.com. Do a search for Rival Ballast. There are a few threads there, and every one I have read, says the people love it. Cheaper than factory ballast, and better. Evidentaly they have an awesome system.
I've had the Rival system for two years. Works great, decent price, and not too hard to install yourself. It is simple and well thought out. You can buy the entire system from them or just what you need- say if you want to use your own bags.