What type of catalytic converter works best for a 1995 bmw 325i and at what cost?

My 95 bmw 325i's cat converter needs a replacement and I am shopping around to see which converter works best but also at a fairly good price. Any advice or links would help me alot.|||A genuine BMW factory replacement would work the best. Some company that sells universal replacements will not have any as good as those supplied by BMW.|||Most cats work the same. So called 'high flow' cats are not needed unless your pushing 500+ HP. To avoid headaches and hassles, find the original OEM cat for your vehicle. Generic ones always say they fit perfectly, but never do.