treadstone is a great intercooler for our cars...also, check ebay for CXRacing intercoolers... they're axcelent quality and work great for their price.. thats what i have...many others will probably agree on that also...i have a lot of friends with other brand vehicles running crx intercoolers and they are performing greatly
also, check paxton, vortech, or procharger...they'll be a tad pricey but well worth it also..
Modular Power House sells them too... they're pretty well priced there
I'm using a 31x12x4" CXR intercooler and controls iats just as well as any IC out there. But I do feel they are restrictive. Before that I ran a 31x12x3" ic off ebay. It was cheapest one I could find at that size, and looked identical to the CRX. It performed great too, but also restrictive I feel.