Mike,
The answer to your question is simple. Anything designed by Danny will be a great monitor. Which one just depends on what your room requires. The important thing is the neutral frequency response. Danny is consistently good at getting his designs to sound very neutral.
I have built and owned a number of GR speakers. I will be using OB 7's with dual powered subs (the new GR servo subs) in my own studio.
The OB series have the added resolution and detail ideal for critical studio work, are very dynamic, image beautifully, and with the subs, will be full range.
You couldn't ask for more.
Cheers