I owned the 20Ts and have listened to the Firebirds for about 2 hours, never heard to VR-7. Based on these limitations, my two cents: First, all fine speakers and obviously, results will vary based upon your room and equipment. The Aerials are terrific in every way except I found bass response limited in my room (16 x 34) and the ribbon is fairly directional. Other than that, they are beautifully made and sound is fabulous. I moved from the Aerials to JM Lab Nova Utopias which IMO are better in the bass, less directional and have a more relastic sizing of instruments and voices, which, to my ears, makes the experience of listening more lifelike. I listened to the Firebirds and the Jm Lab Nova Utopias in the same room with the same electronics (top of the line Burmester gear) and found the Firebirds terrific and in many ways similar to the Utopias (Talon uses, to my knowledge Focal drivers on the bass similar to the Nova Utopias). Had I never heard the Utopias, I would have been in love with the Firebirds. With the Utopias in mind, however, I ultimately, found the Firebirds, at least in this setup, less realistic sounding than the Utopias. I have not heard the VR7s, though I am very curious to hear them and the VR9se. My sense is that the VR7s (new version) will be superior to the Utopias in the bass. I am not sure how the ribbon will fare against the Utopia's Berrylium driver, which I love. In addition to the Nova Utopias, I would encourage you to add to your list the Verity Audio Sarastros and Wilson Maxx IIs.
Enjoy,
Sam
Enjoy,
Sam