Famine, Plague, War, Death, and the horseman they all follow: Capitalism...
Just get the cheapest ones that are resonated. The quality difference is negligible/theoretical as I've yet to hear of one cracking. Worst case scenario, you'll need different bolts. There is some evidence the ART pipes make a few more ponies due to some thoughtfully designed resonators, but they are VERY pricey.
You may need to get multiple de-fouler extenders for the 2ndary O2's or need tuning to keep the ECU happy (the only thing that worked for me). In either case, tuning is advisable without cats.
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