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paulr said:
I think a Speedmaster chronograph starts around $2K. I don't know if it has a screw-down crown. I don't know how much Seamaster chronos cost, if they're still being made. I'm also not sure if they have chronometer certification, though that's pretty meaningless these days. I think Ulysse Nardin has some certified chronographs.
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I second the TZ reference (I visit there all the time). The recent Omega Speedmaster chronographs should be chronometer certified, IIRC. As for the recent Seamaster chronographs (all of them are chronometer certified), there are three chronograph versions (standard, America's Cup, and ACR using the Regatta timer) and all are really nice. I have a Seamaster ACR. It performs flawlessly. Look at the Sales corner over at TZ and you should be able to pick up a Speedmaster for under $1K in really good condition. Even the Speedmaster Day-Date version is going for just over $1K. And only rookies pay the full retail for high-end watches. You can get upto 30-40% off the MSRP for new watches just by looking at online dealers that also offer the manufacturer's warranty.
I somewhat disagree on the remarks of the COSC as being useless. A watch in this price range is not intended just to tell time (a $5 digital watch would perform much better for this purpose). It is a piece of jewelry. Thus, the COSC certification is the marketing hype behind this jewelry (the same thing about wearing a Tiffany ring...it's the brand name). COSC used to mean quality in the past, but it is more of a marketing hype (that is working successfully btw) today. This is true for almost everything we use like cars, clothing, wallets, phones, pens, and dare I mention flashlights. Just look at comparable watches that are not COSC certified (Sinn, Tissot, Movado, etc.) and you will see that they are substantially cheaper on the market even though they essentially use the same movements as Rolex, AP, Omega, etc.
EDIT: it looks like I was wrong stating that all recent chronograph Speedmaster being chronometer certified. Only the Speedmaster Racing versions and some Limited Series are chronometer certified. The standard Speedmaster series (except for those mentioned) are not chronometer certified.