I think u can either try to apply TOP 100 US and Top10 UK econ master programs or seek mphil program in HKU, top PHD program is very difficult even some finance or econ master programs, actually there's very little case for HK Msc getting into Top econ or finance programs in US. As I know, this year many HKUST OR HKU undergraduates got top 20 university big offers(princeton, harvard, yale, warton, NYU, UCB, UCLA,chicargo), but no master students. u need to envisage your postion, and try to improve yourself in many ways. Best wishs!