ya... if it were me i would upgrade what i have, not buy more and have one good cymbal and a bunch of bad ones. i would upgrade the cymbal that sounds worse to you. you can get a cymbal pack, like you said, but idk how much money you have in my currency, so i cant really suggest any. you might end up being just below semi-pro quality cymbals and quite a bit above beginner cymbals in ways of what you can afford, but then i dunno
if you can, upgrade both. thats my advice.
happy drumming
butter