I don't think that the 6's have been put up for sale yet. When they are, however, they will go pretty quick. Even if I were to get some, I want in ceiling and would have no idea how to go about building a box for that.I certainly considered those prior to purchasing my slanted 8's but I wanted to stay JTR for all 7. Also, the Volts don't ever seem to be in stock lately.....not sure why. I just checked again and I see a Volt-6 offered now but it's not in stock either. I'm still considering these for my heights or the CX-8 from Reaction.
I'm in the same boat as you and I think that I'm going to see what Jeff comes up with.