Best tubes for phono-stage?

Both I and a friend had our Audio Research SP-15's(w/3 tube phono-stage)updated by Great Northern Sound.The update turned out to be incredibly successful,and,worth every penny!We have tried low noise TELE cca(TOO thin sounding),a few crappy Chinese &Russian types,Very good 7308 Amperex U.S.(non PQ)>My friend settled on BRITISH Mullard(GOLD PINS)and I on EDISWAN 5358 very low noise types.The results are fine,but should I still consider stuff like Other Amperex(PQ etc.)Bugle boy,maybe SIEMENS?Thought I knew a good amount here,but Obviously I do not.Really would appreciate feedback!