I haven't read A Trail of Blood or the Golden Sheep but I see the latter is from the mangaka of Immortal Rain and I loved it so it's got to be good.
You can't go wrong with Akira. Any of the newer editions are super high quality, it's a solid classic.
Vagabond and Blade of the Immortal are also GORGEOUS oldies but they're super long, maybe look used or older editions.
Anything Asano Inio is gold. The artwork is indescribably beautiful and reading such heavy stories in a book format enhances the experience.
Dorohedoro is super available and on sale everywhere because of the netflix adaptation!! I only have 5 volumes and plan to get the rest this year.
Yaois are shorter and cheaper; Ranmaru Zariya or Nakamura Asumiko are very, very, VERY good.
Happy shopping!!!!!
I know we are all here because we like to save money but .. are there any manga collectors?
And if there are what is the series you believe is worth collecting?
I wanna up mine