This is your answer. With focal plane shutters and dedicated speedlights using HSS/FP sync up to 1/8000 sync isnt an issue. But if you are talking about studio lights (monolights and packs) things get really tricky. With leaf shutter cameras you can shoot past 1/1000 sec sync with studio strobes. What you need is a slow or delayed sync similiar to what was used with old school 1970s m-series camera syncs and class m-series flash bulbs for a slow sync delay (because it took about 20-25 milliseconds to reach illumination with these old flash bulbs). Today we use Pocketwizards with Hypersync for an advanced time sync.
You need these things to sync above 1/250 sec with focal plane shutter cameras and studio strobes:
Pocketwizards (camera must have a Pocketwizard MiniTT1 or FlexTT5) using Hypersync with the peak or tail method
The correct camera AND studio strobe combo.
A studio strobe light with a SLOW flash duration
According to Pocketwizard, sensor size and flash duration are the two biggest factors in how well Hypersync will work. You can get a very clean sync without clipping well past the 1/250 sync mark. How much more? Depends on your strobe and camera combo. You can get anywhere from 1/320 -1/8000. It is not easy to get the 1/8000 sync and factors depend with certain camera, strobe combo and ambient light. Good studio strobes to use with Pocketwizard Hypersync are: Profoto, Dynalite and Elinchrom with slower "S" head flash duration. I shoot with the Bowens Explorer 1500 strobe pack which has extremely high flash durations but doesnt have any slow flash durations for Hypersync to work well:1500w/s = 1/4,170s, 1000w/s = 1/5,700s 32w/s = 1/3,380s. The slowest flash duration I have on my pack is 1/3,380s.
A lot of posts on the topic so you can read more here:
http://www.robgalbraith.com/bins/multi_page.asp?cid=7-9884-9903-9906
http://photo.net/photography-lighting-equipment-techniques-forum/00Y5Q8?start=10
http://photo.net/photography-lighting-equipment-techniques-forum/00YrJV