Hello fellow backtrackers, i have been using backtrack for a while with my laptops stock atheros chipset wireless card and i think its time to add a little upgrade to my pen-testing. I want to add a usb directional card. The question is... which is the best??? I recalled researching this a while back and came up with
Hawking HWU8DD Hi-Gain USB Wireless-G Dish Adapter
however that was a while back. So what i want to ask you guys is.

What USB DIRECTIONAL cards have YOU USED and GAVE the BEST RESULTS?

also, any set backs if noticed on certain models?