Aloha and glad you enjoyed my inks.
I have been inking now for almost 5 years now, and stil growing.
Good choice in the Maru nibs (Crowquill are stiff and hurt the arm), they flex well and can do several pages(im now on 6 pages for one) before replaceing and clean well. Make sure to use dip pen ink and not thick ink.
Microns are good, the felt is strong and the ink is great, also the Fabber-Castell are good. Dislike Copic as i had the felt die to offen, and thierink isnt carbon black.
Also i have been trying the Rotring Tikky and Otheo drafting pens as well.
Now to your question on brushes, well i use most offen a #2 blick masterstroke Red Sable for my brush work.
When looking for a brush keep in mind the following.
Make sure the hairs are stright and come to a point thats sharp, when wet. Differnt hair types as most needed for inking is a sable hair Red is cheaper and easier to get than Kolisky but both are quite good. Also the # of the brush most inkers use between a #2 and #4 round, thier are also long and short versions.
Kolisky Sable is by fair the best but inking will destory brushes compired to watercoloring, this is due to the carbon in the inks.
Ink choice is key to makeing a brush last longer, i use now a 50/50 mix of Black Star matte and hi-carb by Ph. Martin(good for brush and dip-pens), it a finer ink. Tho some projects i use Bombay or Speedball superblack which are easier to get and a bit cheaper. Ink is tricky and you will need to experment to find what you like.
Cleaning a inking brush is a must, make sure to rinse it a fter a few uses and try not to get in in the furel as it collects on the brush and will cause troble, use a cleaner from time to time like 'The master's Brush Cleaner and Pressrver' on the hairs as they need care.
I hope this helps, I gave a comic inkers brush demo here so if its for another job it changes a bit. Inking is close to watercolor so stay with watercolor style brushes and not oils or acylic. Thank you for asking this great question.