It's going to depend a lot on the kind of sound you prefer. I have owned several of the amps suggested here by others and liked things about each one, but they are also all different.
My favorite by far in the upper end of your range (and well beyond) is the Synthesis A100 or its little brother, the A40. Both of these units also have an excellent onboard DAC, although you could try it compared to your Lampizator to determine your preference.
While the Synthesis amps do not seem to get as much attention in the forum as others, those who do have them seem to love them as much as I love mine. I highly recommend adding it to the list of amps you are considering.