I'd thought the 737 order from China was bigger, but I couldn't find a source to quote so I went with the Boeing number. Your info makes sense.
As far as United goes, I've found it funny that United, which is a spinoff of the same parent company that spun off Boeing, is buying Airbus. It would be kind of like a Ford executive buying a Cadillac.
I think Airbus came up by several hundred airframes by "enticing" (read: giving away airplanes) small/nonexistent startups to take A32x instead of 737 models. It's also entirely possible that the 2.5 week delay on their part was based in part on Airbus waiting to hear the Boeing numbers, and then retroactively signing contracts on whatever terms they could get in order to beat the Boeing numbers. When your development costs are fully covered by taxpayers, you can do a lot more to book business.
A friend of mine was a pilot for Jet Blue. He told me that Jet Blue was essentially given the jets and that is how they competed with the other airlines.