Definitely YBA Integre DT. Don't bother with the single transform version even though it is cheaper. It won't be enough power for the Concertinos. I've seen 3 DTs go in the 1100-1200 range in the last 4 months on audiogon and ebay so there are sellers.
And the bonus is if you get an Integre you will be so far up the hi-fi ladder you might find you don't need anything else.
And the bonus is if you get an Integre you will be so far up the hi-fi ladder you might find you don't need anything else.