Number 3 :)

Not very Chinese though? I know from experience that Shanghai does look like a smoggy big Manhattan but something else would add a little local flavour. Maybe a view of the Bund, or something incorporating the Shanghai Mansions?

I'm drawn to #2 with #3 being a couple of minor points behind.

It's the Last Ditch wording that looks good but it would look better on the left. :)

I would say, on aesthetic grounds, #2 or #3. The light background seems to work better, for me.

Of course, if you made a similarly light-coloured banner but combined it with a more traditional image of China such as that in the first banner, I suppose it would look similar. I suppose it all depends on which image of China you think is more representative - and that might change after a few months in Beijing...