Best N.O.S. Tubes for Audio Research LS 25 MK1

MY SYSTEM IS A CEC DRIVE WITH FORSELL DAC,SPEAKERS MANI-TWO BY TOTEM,AMP IS AN EVOLUTION 2000 BY CJ.I BOUGHT A USED ARC LS 25 MK1 WHO REPLACE MY CJ PREMIER TEN.MY NEW ARC LS 25PRE-AMP GOT THE ORIGINAL SOVTEK SO MY QUESTION IS:IT SEEMS THAT SIEMENS,TELEFUNKEN AND AMPEREX ARE THE BEST SOUNDING NOS TUBES (6922) BUT THEY ARE QUIET EXPENSIVE AND YOU COULD GET FOULED IN BUYING A CHINEESE COPY...I SEARCH TUBES (6922) THAT WILL GIVE ME A TIGHT BASS,A FULL BODIED MIDRANGE AND A SOFT BUT DETAILLED HIGHS.ANY RECOMMANDATIONS?PLACE OR GUY TO DEAL??? THANK'S FOR YOUR INTEREST!!!