Here is something I was reading last night.   Don't know if it is of any 
interest to you, and it is just one ham's opinion on different headsets:

http://k8jhr.com/files/headset_notes_and_reecommendations.pdf

As for the "powered adapter box", I assume you   mean something to put 
the needed voltage  to a condenser mic.  I know the Yamaha  CM 500 
headset (about $50 in the US) comes with a small battery box to provide 
voltage, but you would also need to adapt the 1/8 mic plug to the radio.

I think W2ENY  has  some adapters  that plug into the radio's mic jack, 
bring it down to 1/8 and  put the needed voltage to the mic element. 
Of course the radio in question has to  provide some voltage on   one of 
it's mic  jack pins for the adapter to  drop it to the proper voltage.

73, Steve KW3A


On 5/2/2013 7:49 PM, Michael Ryan wrote:
> With the 90CAN cost plus taxes and shipping of the MFJ393, maybe I'm better o=
> ff popping into my local Best Buy and grabbing a pair of Logitech H110s and o=
> rdering a battery powered adapter box. Any ideas on who might sell a device l=
> ike this?=20
> Michael=20
>
> Sent from my iPhone=
>
>
>