As a watercolor artist myself, I agree that a good watercolor block, Arches or Fabriano Artistico would be welcome by me.
I used to be set on my brushes but had to borrow a brush once and fell in LOVE with it. So, giving a new style good brush to try isn't a bad idea. The brush I borrowed and then put on my own gift list for ME is Fibonacci professional sold by Cheap Joes online. My standard canvas size is 8x10 and 12x16 so two rounds, one smaller and one larger is about all I use.
Pens are nice, archival acid free etc with metallic ink would be fun.