Windows RT tablet
I just acquired the Asus Vivo 600T tablet with Windows RT. It can read/write to USB flash drives. Seems pretty well-made, but I've only had it for a couple of days. It has Office 2013 already installed which makes it actually useful. I'm testing it for running interactive Powerpoint files that use hyperlinks including videos. So far, so good. Got a pretty good deal on it, too, at your price limit and that included the keyboard dock for free (usually $179 to $199 extra), although the onscreen keyboard is not too bad and should work for you just using the tablet screen alone.