I have an ASI Rad for my trac, but I have a Mishimoto for my s2000. I've also had a Koyo rad for the s2k and for all intents and purposes the Mishimoto is identical to the Koyo, and comparing across platforms the ASI, Koyo, and Mishimoto are all of the same quality. The only difference between the three is that Mishimoto's come with a lifetime warrenty and the Koyo doesn't. Not sure about ASI. I think the quality is great for what you pay for, and I somehow doubt that the differences between these and other rads is that much.
Only trouble I've had with any of them is when a deer cut me off on the highway.
-Towels