SurfaceRT and stylus - any good?

I've been putting off getting a new laptop / tablet for ages waiting for the Win8 devices to come out. I'm torn between the Lenovo Thinkpad 2 and the Surface RT. Big differentiator for me is that the Thinkpad 2 comes with a Stylus and the SurfaceRT does not. Does anyone know if I can get a third-party stylus for the Surface and if it will work? Or is it only the Pro that supports this. And if I can buy a stylus separately, which of the devices would be best for light sketching and artwork (don't worry - I know it wont be as good as a proper Wacom tablet, I just want to be able to sketch whilst travelling).