I've marked up some screenshots with possible city locations, also showing the likely location of the warlords city.
Red - Dye port city. I like this location, personally. However, it doesn't get us bronze, though that's kind of a non-issue considering we have horseback riding now. The question mark is a suspicious bare grass tile in the middle of forest/jungle that probably contains a resource.
Yellow - This gets us Bronze, Cow, Fish, Gems (if we can culturally steal it) and Banana. It's further away and has drastically less commercial potential.
Green - This is a city we could found even if we take the red location. In fact, I would definitely want to have a city here assuming we take the red location.
Blue - This is the probable location of the Warlords city, and I think it's a good move for them.
Purple - This is a pretty good all-around location, with a lot of production potential as well as grabbing Ivory and Gold to push our happy cap up, along with Bronze. It's further away, however, so I would suggest this as our next city after ours and Warlords.