Neil,
Get a money belt. take at least $2000 usd. Depending on how long you stay. The better hotels will exchange USD for RMB at the going rate. Bank of China will more than likely give you the best rate. Visa cards will get a decent rate also. but you cannot rely on every place you go to take it. about 8 out of 10 restaurants will, depending on the city. It all varies depending on what you plan to do and who you plan on taking with you. But i would count on costing about $3000 usd for a 2 week stay. That is on the high side. but, you are going to want to buy souvenirs for the folks back home. Taxi's, guides, entrance fees, hotels, etc. This trip I am planning on about 12K for 2 months, but that includes my wedding. The flight, rings and apartments already taken care of. This is not a cheap thing we are talking about. it doesnt mean she is taking you for the money. if you fall for her, and she does not have a computer, you will want to get her one. Average cost about $700 usd. A besta translator about $300 usd. it all adds up fast. I think my second trip i spent about $4K. Plus airfare. But everything I did I did first class. My hotel was $100 a night. so it alone was about 1400 plus $1k for computer and translator. I had no less than 3 to four people at every meal. With the guide and driver or friends. Of course you can do it cheaper. I have learned now about the Mohotel. Cut my hotel bill more than half. Eat in the room, cheap and only for two this time. She already has the computer and translator. I mean, I would count on a minimum of $2k plus airfare. Everyone is different so it depends on how you want to take it.
But get a money belt, take cash, your credit card and a copy of your passport with you. Do not take your original passport out in public. if asked show your copy., Ifi t is really necessary, you can go to the hotel and get the original. But if you lose the original, you are screwed for a while depending on your connections. At least if you have a copy to show it speeds things up. That is just my take on it. Enjoy your trip. That is the most important thing. No matter what you do or what you spend. Enjoy the trip and her.
Jim