This opinion is for the benefit of others A-goners assuming that Tgp5audio has made a speaker decision by now. I own the Signature 8 v2 speakers (w/ Be tweeter). I have NOT compared the S8 to the other speakers mentioned above. FWIW, I love my Signature 8 speakers. The bass is very tight and has quite a bit of slam, with a little help from the Paradigm Signature Servo subwoofer.
I do not find the Signature 8 speakers to be bright at all, if anything, the opposite. However, that could be because I drive them with ARC tube equipment all around. Room placement is very important.
I recommend a listen. The newly minted V3 is out. I understand that it is 3db more efficient (rated at 92db sensitivity) than the V2, which means, if I understand the "techno-buzz," the new V3 plays twice as loud for the same amount of power. But who really cares?? The V2 sounds great, IMO, and I can't crank up the volume any higher without hurting my ears and cracking the drywall in my basement from the Servo Sub!!
Maybe I should pull this post. It doesn't seem that the Paradigm Signature line gets a lot of attention from A-goners. If the Signature 8 becomes popular, the prices may go up (sic).