I'm against before we can consolidate a little. Just for a little bit, boys. Right now we could make another settler or 2, then set the food pumps to all make workers and really push our land a notch above theirs. Once that is underway we can start one or 2 wonders up front in their faces.
We've had discussions about how we needed to make sure our land was solid enough militarily before expanding further, and it applies here too IMO. As much as it might scare them for us to dual wonder, it might also push them to league against us - that's my RTS FFA PvP point of view.
What I propose is get to ~2.5 workers per city before we start wonders, so that we're all set with roads and our second ring cities start having life in them. That way, they can come with all they have and it won't seem much - we're just not sure how much trouble we can magnet our way with the wonders right now.