My top 6 (5 is too few) completed anime that I've seen are:

1 - Kenshin with all the ova's, series, and movies
2 - Princess Mononoke - movie
3 - Samurai Deeper Kyo
4 - Scrapped Princess
5 - Tsukihime (i hope for more)
6 - Last Exile

soon to add to the list or when they are completed:
1 - Condor Hero - is my favorite current fansub
2 - Naruto - even people that hate narutards can't deny it is a good anime
3 - Read or Die OVA + TV series
4 - Full Metal Alchemist - still in early developments, but still cool enough
5 - Gun Grave - there's nothing else to say...