From what I know, Luton already has a long waiting list, so you can forget about it anytime soon. The same goes for Vienna, Budapest, Warsaw. Larnaca and Dortmund were also deemed attractive by enough senior pilots, so not a chance for a new hire to go there. On the Balkans the bases which seem to be sought after the most by the locals are Belgrade, Sofia and Bucharest. So, it wouldn't be unreasonable to expect Skopje, Tuzla, Tirana, Varna, Craiova, Iasi, Bacau, Chisinau.