A bit late to the thread but I did find this ---> http://www.inlinefour.com/enkei-classic-wheels.html
They tout some M.A.T. manufacturing process which apparently means the barrel is cast separately and the rim is rolled to improve strength.
I don't have alot of experience with aftermarket wheels, but running a set of their Racing Series (PF01SS) for the last couple years. The price vs. light weight and quality finish..."bang for the buck" has been great. I can't find the number right now, but FWIW they also had a helpful tech support line with reference material on proper off-set and tire sizing.