Smurfit School at University College Dublin
Last year they ranked 23 in the top 100 European business schools, Warsaw School of Economics is 76 which is fine, but Smurfit has very strong links with industry and some of their Masters programs are in the top ten globally. Dublin is an expensive place to live but there's a very well established Chinese community there and Irish people are extremely friendly. Smurfit also ranks very high globally for future earnings and employability of its graduates. In the long run, studying in Poland purely for financial reasons, is not a great career move for someone already as qualifed as you are and with fluent English.