The brands I have the most of?
Pelikan (4 - a 120 Merz & Krell from the 1970's I got as NOS with an EF, 2 M205's - one in Toledo Red, one in Black (M/F) and a M150 - M) The red one had been inked only once. I went fro 0-2 in the same transaction.
Parker - 3 45's - a Flighter (14k-M), a burgundy *Made in Spain"(F), and a desk set/pen(M) and a 51 Special (F) set with MP and an IM.
Mostly singles of other brands - Lamy, Waterman, TWSBI, Noodler's, Pilot,True Writer, and 2 Esterbrooks.
Why do I like Pelikan? Good question. Well made, I can post if I want, but I don't very often with any of my pens. The ones I post most frequently? My 51 and my 45's. The 45's for the aesthetic, the 51 for more practical purposes. Classic design that works well.