A lot of people use the Roush one, it's an easy install. I don't have one myself but was window shopping a few days ago and noticed a high volume there. I'd look on American Muscle or any of the other vendors and just see what you like, read the reviews also and see what people say about them.
I like my Stillen splitter. Looks aggressive and comes with turnbuckles. The only thing I don't like is that it just sticks to your stock splitter with 3m tape.