Sure. The only netbook that comes to mind is the HP Mini 311. It has an 11.6" screen (the netbook itself is only slightly bigger than 10" netbooks), can be configured with Windows 7 Home Premium, has a screen resolution of 1336X768, and can playback full 1080p videos.
The only issue with the HP Mini 311 is that, by the time you add different aspects (such as Windows 7 Home Premium, a 250GB hard drive, etc.), the price gets up in the $475-$500 range. You might as well go with the Toshiba S1125 at $499 if you are going that high.
One last thought would be to purchase Windows 7 as an afterthought. You can find Windows 7 Pro for $65 through Microsoft's student website (I can get you access). Additionally, your university might be offering free downloads of the OS. Check your university's status (some high schools are listed)
here by going down to the MSDN AA Copy of Windows 7 section. My Alma mater is offering up Windows 7 Pro (along with Windows XP pro and Windows Vista business) for free. It is an ISO file that is downloaded, a disc can be ordered for $15.
Lastly, when customizing any netbook, never configure it with more than the base amount of RAM. You can find a 2GB stick of RAM for less than $20 on Amazon.com. A company such as HP will charge you $40 to upgrade to 3GB of total RAM. Why do that when you can spend $20 and get 3GB total (with the Mini 311)?
There are other 10" netbooks capable of playing back HD videos but they come with either Windows XP or Windows 7 starter. There are other 11.6" HD capable netbooks too but their prices are outrageous. They are only only $200 less than purchasing a full fledged notebook that will not only playback HD videos but will last for 7 hours (or more) on a single charge (such as the MacBook). When you get that close to something, you might as well just save your money for a little longer and get a much better product.
One thing you haven't mentioned is price. A wise netbook purchase would fall between the $250-$425 price range. $450 is too expensive as you can find ultra portable notebooks, with
much better hardware (such as the Toshiba), for $499. Many 11.6"-12" HD capable netbooks are in the $600 price area. That is also just too expensive for a netbook. So I suggest that you hop on over to HP's website (make sure to log into their educational area if you are a high school or college student), configure a Mini 311, and go from there. You can get a Mini 210 if coming with Windows 7 is not a big deal (it can be configured with 7 Starter for $30). I don't see why it would be especially when you can install Windows after getting a netbook. You can also find many deals online for Windows 7.
You might also want to stroll down to your local big box retailer to see what types of deals they are offering. You might just run across an affordable ultra portable that would put any netbook to shame or an ION equipped netbook for a nice price.