I personaly prefer silverpoint. I find it to be an extrmely precise and elegant medium. It requires a great deal of patience, good understanding of line quality, and very deliberate placment of strokes, but produces very beautifull drawings.
For those of you who know what silverpoint is, this next bit may bore you. For those who do not, keep reading.
Long before compresed wood encased graphite and pens that dispensed self contained ink many great masters used silverpoint. Leonardo, Rembrandt, Rapahel, Michelangelo, Tiepolo, Chardin, Delacroix, David, Ignes and many many more. Tratditionaly it was a thin piece of sterling silver held in place between two wooden sticks. Nowadays, you can use a standard mechanical pencil to hold your piece of silver. The great thing about this medium is that the silver lead (insert) will last you many many years (I have had mine since 1998 and have hardly made a dent in it) andi it allways remains sharp. It also has the ability to tarnish over the years, going from silver (similar to a 2h or 4h pencil) to a beautifull light brown.
What you need:
a mechanical pencil large enough to hold your silver (.9mm will do)
a mechanical pencil lead size piece of silver (available at any jewelry store that does repairs)
watercolor paper or printmaking paper
gauche or gesso
(optional: marbel dust)
prepare your paper: you can stretch it if you want to, but itis not required. Mix some marble dust into your gesso (this is optional), apply the gesso (you can also use gauche) to the paper with a standard paint brush (you only need a thin coat), let dry, sand and you are ready to draw. While this seems to be alot of work it takes hardly any time at all and you end up with a time tested permnant medium.