Happi, go to Audio Asylum, click on FAQ and read Joe's Tube Lore for an excellent consumer guide to 12AU7s, 12AX7s, 6DJ8s, 6922s and 7308s. Following some of Joe's recommendations, I would upgrade to the Siemens 7308s and Amperex 6922 PQs, though the Siemens 6922/E88CC and Amperex 6DJ8 Bugle Boy/A Frame are probably 85% as good at less than half the price.
You can't go too wrong with the following classical CDs:
Bach: Violin Concertos w/Grumiaux, Holloger, Krebbers New Philharmonia Orch/de Waart, Philips 420 700-2
Artur Rubinstein: Selections from the Chopin Collection RCA Victor Gold Seal
Aria II: A Passion for Opera, EMI Classics
Copland: Appalacian Spring, Rodeo, New York Phiharmonic/ Bernstein, Sony Classical SMK 47543
Ravel:Orchestral Works, Montreal/Dutoit, Decca 2CD 289 460 214-2
Songs of the Auvergne (arr. Canteloube) sung by Victoria de los Angeles, EMI Classics
Rodrigo: Concierto de Aranjuez, Bonell, Montreal/Dutoit, Decca Dig. 430 703-2; 430 703-4
Brahms: Hungarian Dances Nos 1-21, Budapest SO/Bogar, Naxos Dig.
Bach: Brandengurg Concertos Nos. 1-6, English Concert/Pinnock, DG Dig. 410 500/1-2
