Seems cool~
So any suggestion for where can I try and buy Prima?

The Prima looks gorgeous, avery safe bet, according to the distributor, the 2 companies are located at the same building in Italy. With the matched stand and speaker, the price is likely to be 10K+.

Agree Opera is the best matching with with Unico

Opera Prima + Unico

Vienna Acoustics Haydn Grand standard version costs near $9,000. It should be an exciting speaker but may require higher power for best results, Unico is moderately powered I guess. Audio Note is easy to drive and position, some 15W EL84 int amp could already drive it with good results. The only donwnside is its plain outlook.

A bit doubtful that Proac, ATC, Opera, Spendor, Theil basic models will cost under 10k?

How about Vienna Acoustics Haydn Grand? Any comment if compare with ProAc r8s?

Dynaudio Audience 52 or DM2/7
At MK hifi, they have Unico amp, and they sell speakers from ATC, Spendor, ProAc. You can listen to them before you decide.
In TST XX Gallery, you can test with Opera and Thiel speakers too.

Audio Note AX2, not really sure about the current price, may be close to $10,000 or slightly over as shown in the picture. its younger AX1 will cost you less than $10,000 may be $6,000 to $7,000 with a smaller diameter bass. This is made in Denmark. At this price range, there is say EPOS or Tannoy but unfortunately they are made in China or SE Asia.

I am looking for a speaker for my Unico. Budget is under HK$10K, any suggestion?