Looking for advice on shipping my luggage out of China?

Hello, After several years here, I will be leaving China at the end of my contract in a few months time. I estimate that the goods I want to ship out are about 5 cubic meters. I am not in a hurry to get them at the other end and want to keep costs down. So ocean freight is what I am looking for. I would appreciate suggestions of a reliable trustworthy company that does freight forwarding from China? Very importantly, it needs to be a company that knows how to deal with Chinese Customs and give me advice on what paperwork to prepare. Thank you!