I tend to use Wacom tablets - from A3 to A5 sizes - and I have them to the right of the keyboard next to the mouse. I am not sure what you mean by integrated though - you shouldn't need to look down as the position of the stylus is shown by the cursor on the screen.
One of these tablets uses a very thin stylus (it is the least usable), the others use ones that are the same size and shape as pens.
I don't understand what you mean by "Superscripts and subscripts are impossible with most current styluses" - these should be possible with all styluses. It will just depend on what point size you want to use with your tablet.
For detail artwork I use my A3 tablet, but even the A5 one I use every day will happily cope with superscript and subscript.
Have you looked at the Wacom Intuos range?
disclaimer - I don't work for or endorse Wacom, but for me they have proved to be the most dependable and usable over the last 18 years.