Since I don't have a ready-made list of those, I'll change things up a little and give you my list of favorite artists who worked on my favorite GN's. Note that I'm mainly a reader of Euro GN's, as you'll see: (click for samples)

• P̲i̲e̲r̲r̲e̲ A̲l̲a̲r̲y - Stylish, kinetic work featuring figures with unusually expressive, even eccentric faces. His cartoony style works surprisingly well for historical fiction, which Alary demonstrates again and again. [Don Vega, B̲e̲l̲l̲a̲d̲o̲n̲n̲a̲☑, Conan the Cimmerian, SinBad, Silas Corey]

• D̲e̲n̲i̲s̲ B̲o̲d̲a̲r̲t̲ - Just as Alary is a master of motion, Bodart is a master of bringing stationary figures to life, particularly in his Victorian-era works. [G̲r̲e̲e̲n̲ M̲a̲n̲o̲r̲☑, <many more>]

Aaand the other 17 are here.

(yes, I need to migrate that list to the FV!)

I'm currently reading Transmetropolitan, but I recently finished Uzumaki which was great!

Does Transmetropolitan count if it was released as a comic first? I read it as three big books.

Anyway it's fantastic but also a bit hard to describe. The most I can say to draw you in is that it's a cyberpunk dystopia and the main character, Spider Jerusalem, is a Hunter S Thompson expy. He has a sonic gun that makes you shit yourself.