best speakers for vocals?

I agree with Songwriter72 on this one. I own the Green Mountain Audio Callisto which are way under your budget. Live sound with voice like the band is right in front of me. Friends say the band is here. You could easily move up the GMA line. Give Roy Johnson a call at GMA.

http://www.greenmountainaudio.com

The original Quad 57s. Nothing else, except maybe the big Soundlabs or the Beveridge, come even close.

I must disagree with Jtgofish - I have owned many speakers over the years. Electrostatics (Martin Logan CLS, Quad 57's, Quads 63's) and heard many others. Also owned ribbons (big Apogee Scintilla) and planars. I have come to the conclusion that great dynamic speakers sound the most real.
I really cannot say what the best speakers for vocals are. There is no correct answer given all the system and room variables. There are so many things out there and everyone has such varied tastes. However, I can say that the Verity Parsifal Encores were spooky real on voices. However, I do not think it will do everything you are looking for (not as dimensional and airy as some).

Audition a pair of Spendor S 3/5's (originals, not the se version)with some medium powered tube gear and you will be amazed.

YOu would love horn speakers.
Aside from the modern horn speakers,
Highly recommend the vintage Jensen G and CX and EV TRXB coaxial speakers from the late 50s to early 60s.
Very sweet highs and good bass too.
The only thing you should keep in mind is build your own or finding the cabinet for these timeless drivers.