Default firmware question??

hello i am form philipines and i have this galaxy ace s5830. i did upgrade it to official 2.3.4 and now iwant to upgrade it to a higher version? what firmware is suitable for my country? is it okay to use another stock firmwares from other countries? btw ididnt buy this phone in my country . ithink my mom bought it at honkong but at the back of the phone says made by samsung heeeeeellllppppppppp!!!! can i use some firmwares from other countries???