Start with this ones (depending on ur taste):
YuYu Hakusho - Fight
Death Note - "Detective"
Full Metal Alchemist - all around
There is a lot of good animes like slayers, monster, cowboy beebop, etc... use: http://anidb.net/perl-bin/animedb.pl?noalias=2&orderby=rating&orderdir=1&show=animelist
www.cuidar.com.br