For anyone who saw a note on xlr8yourmac about using an AirlinkPlus+ card on the mac as a cheap gigabit card, don’t do it.
It uses the cheap Realtek 8169 chipset. While these do have Mac drivers, the cards are in my experience not as fast as the d-link 530T I mentioned earlier. While my experience with both these cards is in linux and based on those drivers, from what I have read this is really just a cheap chipset and not worth the $5 or $10 you will save.