I will go either with Aegean or Turkish, but haven't decided yet. Will also depend on any status match offers.
Aegean has the lowest requalification threshold overall, if you manage to have the 4 legs on their flights (12000 miles on Star Alliance + 4 legs on Aegean).
Turkish seem to have the lowest requalification threshold without any required legs on their own flights (25000 miles on Star Alliance) plus they give status for 2 years.