i never got the hype of gantz, takes way too long to progress, the manga ain't as bad couz you can read faster past the boring stuff.
SAO is pretty decent.
Hellsing is pretty good.
don't know the other ones.
If you're into warships and sci-fi naval battles, Arpeggio of Blue Steel is nice.
don't know arpeggio of blue steel, but i can highly recommend Last Exile within the same genre.
used to follow kuroko no basket, was pretty nice. have to check the extra game follow up.
never heard of hajime no ippo, have to check if it's any good.