Please help me to pick a speaker...

The speakers you listed are all very, very good. Just be careful to match your relatively low powered integrated amp with relatively high efficiency speakers with a flat impedance curve. While I like the Dynaudio's, and own some of their bookshelf models, I don't think they would be a good match with your amp. Maybe consider Von Schwiekert VR 4jr's, although I'm not sure if you can get them for $2500 used. Another option are Silveline Sonata I's or II's.... I own the II's. They are very efficient, full range and aesthetically appealing. A great value IMO for approx. $2500 - $2800 used, although you have to be patient from an availability standpoint.

the proacs are the best by a long shot. they are still made in the uk unlike the vs which is now from china

Jaybo, maybe there would be good synergy since the amp and cdp are already from China?

Hollychau, I am running VSA 4JRs with a KT88 integrated and they sound great.