The Windows 8 tablets are almost all Windows RT, which runs on the ARM processor.
This means it only runs applications designed for it, not for any other Windows operating system. If it makes sense, think of it as a totally new operating system, because it really is. You can only install software from the Windows Store.
There are some Windows 8 laptops, that run a the real version of Windows, that also have a tablet touchscreen interface. These devices can have 'regular software' installed on them, like any other Windows 7 laptop.
Assuming you want the full OS, just make sure it ins't Windows RT.
Something like
http://www.dell.com/us/p/xps-10-tablet/pd might be more what you are looking for. There are other options,
seen here, but as you can see, not really in your price range.