air manifold valves

what is a good 1/2 air manifold valve

I like the asco's,...but im not sure who carries 1/2,..most ive seen are 3/8 like Asco, AccuAir, and airride tech

http://www.streetnshow.com/catalog/index.php?cPath=55_102

smc has a nice lookin 3/8 manifold, donno how good it works, but its smc it has ta work good