Which Amp to complete my system?

PS- not bright at all.

Those are nice speakers. Consider the Sophia Electric 300B mono blocks. You would have to spend a lot more money to equal that sound

I would think a nice class A ss amp, such as the Pass XA 25, would do wonderfully. I own Lascalas, modified and tweaked, and heard one 6 months ago through another pair of Lascalas. I was contacted by a  friend, who had a customer of his wanting his Lascalas modified, which I do ( horn damping, etc. ). I was totally engaged while listening. He had a CJ preamp and the system was cd based. I gave up on tubes quite a while ago ( for various reasons ), but I would never discourage another listener to do the same, especially with horns. I would be happy with the XA 25, and just might have to spring for one. Enjoy ! MrD.

Luxman MQ-88 or the PrimaLuna Dialogue. Heard both w/the La Scala III's.

You really want to hear what those LaScala's can do?  Put them on a low powered SET amp like a 2A3 or 45.  Case Closed.