Only want to pull JSON Class not all data

I don't think you have much of a choice here, yql provides you a proxy to query the resources that are not on your domain. you can make your own server side proxy that can filter the results and return you the desired output in json format.

What I had to do and was unaware of was to use XPATH at the end of the YQL statement.

    select content from html where url="http://www.resellerratings.com/store/Burkett_Restaurant_Equipment_Supplies"
 and xpath="//span[@class='count']"

See here