Boy, don't I wish it were that simple! Not only does it have to be PCI, but it has to support 10/100 and all 3 different connection protocals (RJ45, BNC, UTP). I managed to find a 10Mbps one that met those standards, but my boss is very picky!
hambone is right ..and funny.
RJ45 and UTP are the same connection. YOu can find PCI 3 COM Cards with BNC and RJ45 connections. I don't know why you would want that though. BNC is a coax connection at 5-base T and RJ45 will support up to 100MBs on good CAT 5 cable.