Sound of the sonus Faber concertino

Hi, i have a sonus Faber concertino with a bad 3020b, i love their warm sound.
Since I need 2 more speakers i have 2 options:

1) build my own speakersBut idk exactly witch drivers put.

2) buy some speakersAnd the budget is 500€ for pair
Can you help me?
I have no problem with building speakers, i did it before in 2011 and i enjoied doing itWhat do you think is the best option?