Need some opinions :3

Death Note is a freakin' masterpiece and toi need to watch it right away.

That's all that needs to be said. x)

toi should watch Hitman Reborn. At the beginning of the episodes, you'll feel a little bored.
But, if toi keep watching, you'll find that Hitman Reborn is super awesome. :3 It's like... mafia with super hot guys. *__*drool.
Beelzebub and SAO are awesome, too! <3 XD

The only ones I've seen on your liste are Hitman Reborn and Death Note and both of those are amazing~ If you're looking for something with plus comedy and action then I would suggest Hitman Reborn. But if you're looking for suspense and mystery then Death Note. Both are very different so it just depends on what toi like :3

Don't care about the order, just hurry up and finish watching them all!

Watch death note. It's beyond amazing.

I'm afraid I've watched none of the first four and have only watched one episode and read most of the manga of Death Note, but from what I've read Death Note is a truly brilliant manga. Extremely well-written with believable characters, very dark in many ways, yet without loads of graphic gore and violence. It's knowing what the characters are thinking and plotting that sets shivers down your spine...as I said, I only watched episode one of the anime, but it seemed fairly true to the manga and the artwork was lovely. I think I heard somewhere that there is also a live action series of it, I haven't seen any of it but it may be worth checking out.