D-Link are alright. What you are looking for is a router, if you want to save a small amoint, as you already have an access point, although it might not be a great make, but it'll probably work fine. You should find out if it's 802.11b or 802.11g, if it's 802.11b then it might be worth getting an 802.11g wireless router for the faster speeds, and not using the access point. Also remember to make sure the PCI cards are 802.11g too.
Take a look at the wireless stuff here:
http://www.netgear.com/products.php