Primarily listening to guitar-oriented Classic Rock (Beatles, Led Zeppelin, AC/DC, Boston, you name it...) ...
AC/DC, April Wine, Boston, The Cult, Deep Purple, Iron Maiden, Led Zeppelin, Pink Floyd, The Who...
I like lots of bass but it needs to be tight, articulated midrange, and not aggressive highs. Detailed if possible, but no harsh highs.
Yup, the Paradigms will give you that, IMO.
I enjoy listening to music with a loud volume. ... Possibility of listening for hours without ear fatigue.
I used to enjoy loud volume (and occasionally still do) but I've never listened to anything "for hours" so, unfortunately, I can't comment specifically on that last point.