Paradigm probably better depending which monitor speaker and which Athena you're talking about.
For instance I'm not sure which Paradigm monitor sounds better than the F2 as that Athena is quite a good speaker.
I think the Titan is better than both the B1 or B2 bookshelf.
The Athena B1 and Paradigm Atom are pretty close but the Paradigm has better build quality. The newer versions are probably even better now. The B1 is a 8 year old speaker now with no upgraded versions since the B1.2. they are discontinued now as is Athena overall.
Many say that Yamaha and Athena Auditions are not good together because they are both "bright." I have an all Audition setup with a Yamaha 765 and love it.
I think that was the older Yamaha receivers that were considered bright sounding. I used to have a Yammy 595a and Athena B2s and B1s and it was a pretty bright setup. I sold my 595a about 4 years ago and sold all my Athenas this January. I have Energy RC-10 bookshelf speakers now.
I haven't heard anyone say that about Yamaha receivers in probably 5+ years. Now that these newer receivers have YPAO room calibration software that probably isn't an issue anymore.
When I was deciding upon a receiver for my Athena's, I read a review for the 765 which carried over the old warning about matching speakers because of the Yamaha bright reputation. It seems that old news dies hard with some reviewers. I bought the 765 anyway and love the combination.
We decided to follow the Marantz SR7002 route and the results are very good. The receiver/Athena speakers combination seems to be very good. The end result is much more refined and the SQ improved a lot.
Apologies if this is inappropriate, but seeing as everyone is buying/selling their Athenas in this thread, I just thought I would let everyone know that I am selling my S.5 setup. I have 5 S.5 speakers and a C.5 center for a 6.1 setup (with your own subwoofer). All working and in reasonable shape after 5 years or so of usage. I have the box and the manuals. Local to Boston area only. PM if interested.