I've had people whom I respect tell me that they like the new Tung-sol 6SN7. I purchased one and didn't like it, as I felt it made my system sound more boxy and constrained. Tried it on three different occasions, over the course of over a year and this was my impression each time.
I've liked many of the vintage 6SN7s better, even the less expensive ones like 1960s Westinghouse and relabeled Organ brands like Conn and Baldwin. I've been able to find these in very good condition for $15-$20 each.
I have heard from manufacturers that the new Tung-sol is a very consistent tube, that the failure rate is low and that they are easy to match.