The better-looking girls in the Gal'DB are the Hotel Reservation girls, but none of those advertised as Chinese speak any English, nor will they make a "classy" impression when dressed in their street clothes.
I would go with one of the fake Japanese or Korean girls as they usually know some English and have spent some time somewhere other than Mainland China and probably have a bit more fashion sense. But given all the photoshop work done on most of the DB pics, you're not going to know if a particular girl really is beautiful until she is standing in front of you.
But in any case, if you want to have the girl spend time walking around with you, you're going to have to pay some multiple of the price quoted in the Gal'DB which is for 45 mins at her hotel. Also, initially at least, you're going to be dealing with these girls through their agents. If you did meet a fake Japanese or Korean girl you liked and then asked her to spend the afternoon with you, you might be able to negotiate price directly with her and save yourself some money, but that's not certain.
It might, though, be more economic to work something out with an independent WG met through craigslist. Check out Caligynephiliac's find in this post:
http://forum.sex141.com/eforum/v ... &extra=page%3D1