I like the music in Space Dandy, but haven't gone out of my way to get it.
Yoko Kanno is definitely the gold standard for anime composers these days. Part of it is that she's got a few styles and applies them expertly to the work at hand. Like Escaflowne is a fantasy mecha epic, and full-on orchestra works. Ghost in the Shell is existential cyberpunk, so electronica works very well. And then Macross Plus is a mix of top gun, mecha and cyberpunk themes, so both styles work,
Cowboy Bebop was designed with jazz at its very heart, and Kanno adapted to that. She uses many of the same musicians - Mai Yamane sang nine songs across the Cowboy Bebop soundtracks, including "the real folk blues", "want it all back" and "don't matter none" - but she'd worked with Kanno on Macross Plus and Escaflowne before that, for example.
(oh, and in checking Kanno's wiki page, I see she did the closing credits and 4 other tracks for Space Dandy)
I have to say, in general I don't seek out anime composers (though I am a big fan of Yoko Kanno), I'm more about the songs, which aren't always written by the composer. Gundam SEED lead me to be a fan of TM Revolution, High and Mighty Colour, and Nami Takami, for example.