Very interesting choices!
I am always positively surprised when you guys are doing a medium to large airport!
I would list according to relevance like this:
CYUL = Why? Because virtually no airport in Canada has been made in quality forth taking note of. Descent NGX traffic in and out and even PMDG 777 future traffic.
EFHK= Scandinavia has been looked over and Finland especially. Right now Finnair is making a move at the market for routes to Asia. BUT the traffic besides Finnair is not very interesting. Not to forget amazing winters.
VTSP= Personal favorite although it's simple structure the destination sees a lot of interesting intl. traffic as well as long haul types flying from Bangkok. Plus side would be your touch to the beach close to the runway threshold and the surrounding terrain.
Prague= this city is very popular for weekend holiday makers in Europe, and it would be nice if some of the city would be visible in the vicinity of the airport. Also the traffic has become fairly interesting in the past years. But personally I place this lower as the destination and airport lacks appeal to me.
My two cents