Purchased this card at Microcenter (http://www.microcenter.com/single_product_results.phtml?product_id=0316296). Out of the box works on Ubuntu 9.10, supports WEP, WPA, WPA2 and has no stability issues transferring large files etc.
Attempted to install the card under Windows 7 x64, x32, and Windows XP SP3, all of which did not recognize the card without additional drivers.
Summary: PCI wireless N card that is Ubuntu compatible with a price under $25
Grade: A+