Best CDs for vocals?

A must is "Audiophile Voices, Volume 3". You can buy it on ebay.

Thanks :) I will check that out.

I really like:

1. Diana Krall, Live in Paris
2. Eva Cassidy, Live at Blues Alley
3. Oscar and Ella- Duo
4. Carmen McRae - ( This is a poor recording, on a small label, Jazz Merchant, but, I love the music on it and Carmen sounds great on it.)

Just a few suggestions, Tube gear preferably of course. Although I just picked up a Proton A1150, which initially I thought sounded thin, but after further review, it's not too bad for a bedroom setup.

Happy Listening

I'd add to the list:
Jennifer Warnes - "Famous Blue Raincoat" & "The Well"
Holly Cole: "Temptation"
Bonnie Raitt: "Luck of the Draw"
Eva Cassidy: "Songbird"
Etta James: "Life, Love & the Blues"
Mark Knopfler: "Golden Heart" & "Shangri La"
Dixie Chicks: "Home"
Chris Thomas King: "Me, My Guitar & the Blues"
Runaway Express: "Oh, Boy" (local Denver band does Buddy
Holly stuff really well; check their web site)
Ray Charles: "Genius Loves Company"

That should get you started.