I have listened to the T45s, but it was not in a good listening environment as that dealer was trying to sell me their high margin speakers.
I believe there are some PSB owners around here. Hopefully one can give you a comparison.
The M22 would be similar to the Studio 40 and will play much cleaner than the Studio 7. As a bookself it will probably have less bass. There is a good review here at Audioholics that covers both the Studio 40 and the M22. If you type Axiom M22 into the search box you should find it.
The M60 is probably most similar to the Studio 60 and the M80 would be similar to the Studio 100. It is hard to say what the differences are between two speakers unless there are large differences like between the Monitor 7 and studio line or Axiom line or you have done a direct A/B comparison, which I have not.
The M60s would be at the top of your price range at around $950.
I own the M80 and would characterize them much like the sound you describe that you like. Live recording sound live (something I really like). They come across crisp and clean and they have that edge that live stuff should. Kick drums are tight. Not boomy or muddy like with the Monitor 7. The M80s are a little above your budget at around $1300.
The M60 is quite similar to the M80 with a little less bass and less detail in the highs. Perhaps a little less transparent??
Some describe the Axiom line as being bright, I don't think so. The 80s and 22s are unforgiving of poor recordings. If it is on the recording, good or bad, you will hear it. Good recordings like Clapton unplugged sound great. Well recorded chello and viol has that rich textured sound that these instruments should that the instruments have in a live performance.
Not so well recorded material sounds just like that. I have both Close to the Edge and Fragile by Yes. Its not that they sound outright bad, but like there is a veil in front of the music and that extra level of detail and subtlety is missing.
OK, enough babbling. If you have found the PSB T45 locally, give them a listen. Go back to the Paradigm dealer and listen to anything in the Studio line. Even if you can't afford them, it will give you some idea what you might be looking for: a reference point.
I'm going to go put my Viol disk now.
