I'm using the PCI adapter that comes with the D-Link DWL-500 desktop WiFi adapter kit. The kit is a PCI adapter + DWL-650 PC Card.
The orinoco card is a 5 V 16-bit card, while the DWL-650 is a (32-bit ?) 3.3. V card.
One adapter to avoid is the Netgear adapter, which I have seen reports of being designed specifically for the Netgear PC Card.
In general, if the PCI adapter is a PCI to PCMCIA bridge, then you should be okay.