I've got the Daystar 1. 5" on my front end. Just slightly tail high when empty, but much better than the nose-dragger from the factory. It is perfectly level with the 5er hooked up.
If I wasn't going to pull I would have went with the taller spacers. They claim over 1. 5" may require control arms, but that is a generic warning and I think we've got plenty of range left.