Jh2os, I've got a pair of Mullard CV4004/12AX7's and a pair of Amperex 7316/12AU7's on the way. I'll be sure to post my thoughts.
I also plan to try other tubes later on this summer. My "discretionary spending" is maxed out for the time being although I probably will pick up a few inexpensive tubes for comparison. :-)
What EL-34s have you tried and what are the differences? Less punch more smoothness? (this is what I tend to read usually)