Your graphics card is PCI-e and is not related to the PCI bus in the classic sense. A PCI-e wireless card will have no ill effect as well, other than taking up another slot.
As for a wireless card, try this
one and use the Atheros drivers (Atheros AR5008). This
is also a good choice.
For Bluetooth you'll need to get a USB adapter
. If your a hardcore online gamer, then you will want a wired connection rather than wireless, since wireless has a higher latency.