what company makes a good wideband o2 sensor that will go down to at least 10?

 

I have the aem wideband it works great for me.

 

http://www.innovatemotorsports.com/index.html

 

10 is pretty freakin rich... i know i have been holding out for the innovate wideband myself, but there really are a lot of options as far as widebands go. The main issue you will run into with most widebands when you are trying to play around 10:1 is that the sensor does not generate a voltage below 10:1 AF. The most common cheap ($50-75) wideband 02 sensors simply dont work down there, so you might be looking at specialty equipment altogether, because most widebands under $300 are calibrated to work with the wideband sensor style represented by the graph below.
This map shows what i am talking about.

 

i have the innovate lm-1 wideband and love it and it goes well belowe 10...