Tube amps

I've decided to upgrade my current SS amp (McCormack DNA 0.5) for a tube amp for use with my Wilson WP6 speakers. I am looking for a little more warmth in the midsection and think that tubes may be the way to go.

My budget is around $2000 used and so far I'm considering the following candidates:

1) BAT VK-60
2) Cary V12i
3) Primaluna 7

I would appreciate any comments or opinions anyone might have on this.