usb wifi dongle for advanced testing - recommendation request

[CeDeROM]

Hello :-)

I am looking for a really good and well supported WiFi USB dongle for
advanced testing like network sniffing, packet injection, setting up
access point, etc. I guess that would be Atheros based device? Can you
recommend a solution that works for you? :-)

Thank you! :-)
Tomek

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info