Re: current production tubes...
I've only used NOS pre-amp tubes Christian, but for a long time was a big NOS snob...thought only they were good enough. Then I tried the new series of Groove Tubes 12AX7's.....really great tubes. Specifically the C's and the M's. I've compared them to my NOS Bugleboy's, Mullards, RCA's, GE's, RFT's, and the GT's stack up very well...95% as good, at least, and at a great deal less money. I think the C's and the M's are around $20 now. I've also used the JJ's, and I find them somewhat underwhelming. I did try one of the new higher gain JJ's, can't remember the number right now, but it was much better. Overall, I find the standard JJ's nice to smooth out an amp, and tame some brightness.
I also believe GJ recommends the Sovtek LPS's, say they are an outstanding high gain pre-amp tube. I haven't tried them myself, but would on GJ's recommendation alone.
I really haven't used any NOS power tubes, although I would like to try the Seimens. The last of the really affordable NOS pre-amp tubes are the RFT's, at around $30 each. I plan to stock up a few of those, just in case the new GT's take a crapper in quality.
These have all been in my modded JCM 800 2205 circuit.