Hrm...difficult...as has been said an "other" option'd be nice, but you're new, I'll let it go. XD
Neverminds, you got it.
By the way: Welcome to the Escapist.
OT: Death Note's pretty good, though not exactly my speed. Bleach was EXTREMELY good before it developed "FILLER ARC OF DEATH!!!!" syndrome (I've never been able to watch the entire Bount arc. I just don't care at this point.). Big O remains one of my favorite giant robot anime, a close second behind Tengen Toppa Gurren Lagann. The early (like very early) episodes of Inu-Yasha showed lots of promise and then failed to deliver, quickly devolving into "Monster of the Week" episodes. Fullmetal Alchemist Brotherhood looks good (following the manga=good in my eyes, though artistic license does have it's place).
And now for something completely different: manga that should be made into good anime. Mahou Sensei Negima is definitely first on this list, followed closely by Hayate the Combat Butler. Shaman King and Fairy Tail are also very high. And that's all I can think of off the top of my head, though Kandachime might make a good one if it's handled correctly.
Yeah, I have difficulties with making up my mind.