Harbeth P3Es2 or Spendor S3/5

They are both great speakers from the UK made by companies where there is very little turnover in their personnel. I can recommend a great dealer I was referred through audiogoners named Gene Rubin Audio. He has great experience matching these components. I find him to be very honest in his correspondence about how they behave with tubes and ss.

I have heard both and think they both do a wonderfull job with vocals. With that said, you should also audition Tannoy, B & W 800 series and ATC 7s, 11s, and 19s. I favor Harbeth and ATC for their neutrality, and if this is something you also value, you would do well to hear the ATC's first. They are the most utilized speakers in professional studio environments (used by over 1,000 established sites) and their consumer gear is second to none for reproducing the widest range of genres. They work better with solid state.

Both Harbeth and Spendor will sound great with the VTL.

I would not recommend the ATCs, which favor the purer sound of solid state over tubes due to their neutral design.

You might also want to audition Zucable speakers. The Zu Tones and Druids are very dynamic and lively and have an overall warmth to them--lot's of tubey magic on the ones I have heard at tradeshows. They might match well with your system and are priced about the same as your speakers above.

As a safe bet, you should also contact VTL directly and see who they use for demo purposes.