Onkyo is the parent company of Integra and Integra Research. They are different levels of the same company. The best analogy I can give is consider the Integra Research group to be comparable to the Sony ES group.
I am extremely happy with the quality of my Integra 802. We use it in the den and it is pretty easy to use, a reasonable WAF.
They recently started shipping "Net" capable receivers. Pretty awesome value in my mind.
Certainly worth checking out.
regards,
patrick