Pens
I mostly use dip pens, where you dip into a bottle of ink, draw your line, dip again, etc. as compared to continuous flow technical pens, felt tips, rollerballs, and so on, although I've used those, too. Dip pens (sometimes called crowquills) react to pressure and angle, giving a variation in the line that I like. I have about 20 different nibs I use; Hunt and Gillott were the brands I could find in the early 1990s. Now I'm adding Japanese nibs, given the popularity of manga and these nibs becoming more widely available.
Inks
I've always liked using the blackest permanent ink I could find, so for many years I used Higgins Black Magic. More recently, I've been using Dr. Ph. Martin's Black Star Hi-Carb. For color inks, I've used a Rotring set I got a long time ago; I plan to replace it with Dr. Ph. Martin. For metallic inks, I've used Winsor and Newton. Since the 1990s, inks have come a long way and the variety available now (especially in the fountain pen/calligraphy world) is remarkable. I look forward to using many of these new inks.
Papers
Making the jump from student grade paper to artist grade is like night and day. For my last semester drawing class in art school, we were required to use Rives BFK. I've never looked back. I mostly use Arches Cover, Rives BFK, Revere Platinum, and Fabriano Artistico. I've started using all-cotton mat boards, too. I usually use hot-pressed papers for better details.
Silverpoint
In the 1990s I heard about silverpoint, but it was very hard to find any information on it (this was before the World Wide Web existed). About all I knew was that you could draw with a silver wire if the surface of your support was rough enough to abrade the wire. I knew that my silver ring would leave marks on a latex painted wall, so my guess was that gesso, being whitened with ground marble, would be abrasive enough. So I coated a sheet of Rives BFK with gesso. I went to a jewelry-making store and bought one foot each of three gauges of silver wire. To hold the wire, I decided I could wrap it around a copper tube about the diameter of a pencil. I cut a slot in the end of the copper tube, wrapped the wire around the tube and hooked it into the slot, with about half an inch of wire extending beyond. Using a sandpaper block (the kind you use to sharpen a drafting pencil), I could shape and sharpen the silver wire to my liking. Over 20 years, the gessoed paper has yellowed a bit (probably due to the gesso), but the silverpoint lines have mellowed nicely into a darker, softer hue as the silver has tarnished.
Watercolors
I prefer pans of paints instead of tubes. That's because my work is detailed enough that I rarely need to mix up much paint at any one time. I also like the portability of pans. I have a lot of Daniel Smith paints, from before the change in ownership. I'm now beginning to use handmade paints from Greenleaf and Blueberry.