I've seen...I dunno, 8 episodes of Gravitation. Its okay, but my girlfriends just in love with it...her and her yaoi, sheesh >>; Anyway, yeah, it is a cool show.
DBZ, sure, its cool too (Everyone knows I like DBGT better because of Pan though, but eh, DBZ DOES have better fight scenes).
My most FAVORITE anime of all time...now thats a tough question. I'd have to say Neon Genesis Evangelion. Or Slayers (Specifically NEXT). Or Ranma ½...thats the best manga I've ever read at least. Or Tenchi Muyo -- the Ryo-Ohki OAV is basically what got me into anime in the first place! And theres DBGT of course, can't forget about Pan! Oh yeah, and KO Beast Century is REALLY funny, thats definatly a favorite. Almost forgot, Read or Die too! And lastly, Mamono Hunter Yohko, cause thats cool.
So there you have it, my narrowed down list of the...8 animes I like best! (Don't quote me on that, I probably left some out).