Go with a Spearco Water/air. You can plumb it yourself and it isn't as expensive as the vendor units. With the Water/air it will not block the radiator and there are no low hanging parts. You can also put ice water in it at the track for some extra power. I did a custom Spearco on my 91 Vette and its not that hard or expensive. They used to have a website with core sizes and everything but you may have to go to a distributor now. A lot of the kits out there use Spearco cores.
Wellll, it's priced competetively with the other two coolers mentioned (Paxton and FastTrack).
If you are seriously interested in the ATI 3-core sheetmetal, I know someone selling one with the mod motor mounts for $500 less than retail. Let me know if you are interested and I'll give ya the link.
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