think it is a good choice for u to choose HK to study finance.
For school choosing: I think Both CUHK and HKUST are ok, the final decision depends on ur personality and preference on classes structure of the two schools.
For the job-hunting: Recently, the economy in HK is becoming better, but still not sure about the job situation. In mainland China, according to some new report, it is also better and better now.
Last, there is nothing can guarantee your future except yourself. Think carefully before act, think hard, work hard, then study hard!!
Good luck | 
