There are no G cards that work with Aircrack, and there are no patched HostAP drivers for Cxx0 (2.4.18) AFAIK. All my attempts to build them have failed.
I believe the Planex cards work well, and I have an Ambicom WL-1100C, which I have had no issues with (and which works with Aircrack).
Hope this helps.