Outside of the Tung Sols (which I have never heard, the only other new 6SN7's that I am aware of are ElectroHarmonix, Sino, and Sovtek. The EH sounded pretty good in my preamp. It is also well constructed and should last a while. The Sino was actually the stock tube that came with the preamp and I found it to be strident and almost confused musically. I have never heard the Sovtek because I moved right into NOS VT231's and even 5692's after using the EH for a few months. I think it would be safe to say that the new line of 6SN7's cannot compete with the older NOS tubes for sound quality.
For your interest, here is one of my favorite 6SN7 web sites:
http://www.tubeseller.com/ratings.html