My top five would be.........hmmm can't decide the first place since wat i watched i loved it at that time and still do, anyway here are some of them
DragonballZ, Rurouni Kenshin, Bleach, Get Backers, Hungry Heart, Inuyasha......i'd give more, but u wamnted just five so here they are
I mostly read manga, and I've only seen the more recent animes, so I only have four on my list...
1) Fullmetal Alchemist - the plot is good and there are some nice plot twists
2) Death Note - the characters are rather interesting, not just stereotyped
3) Bleach - would be rated the same as Naruto, but its fillers are more interesting and are ending more quickly so it gets a higher position
4) Naruto - would have gotten a higher position IF they would have ended the fillers like last year...