PBM
It's even cheaper than the Mishimoto unit and PBM has amazing customer service (second hand knowledge).
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I have ran a Mishimoto for a year and a month (exact). About a month before I switched over to a Koyo Copper (as a replacement) the Mishimoto started slowly leaking fluid from somewhere on the bottom.
That
slowly turned into a quickly which is why I replaced it.
Mishimoto does offer a 1-year NQA Warranty, but mine went out a month after the warranty expired.
That said.
I paid $185 for my Mishimoto, which is a hell of a deal over the Koyo.
with
That said.
A friend of mine is running an ancient Aluminum Koyo and it's still going strong.
If I had to do it again I would have still gotten a Mishimoto.
Another friend of mine, a local shop owner, has been running Mishimoto on his KAT since they were released. The only thing that killed it was a head on collision about a month back.
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If money is no object get one of the Gucci radiators the other guys mentioned.
But if money is an object, I think you already know what to do.