Hello Sergio,
Besides the suggestions of Mike, which are very good, you could also take a look in
http://www.freeloops.com, it's a site where you can download free loops, and has many styles to look for. Another very good option would be to look to the BFD2 Virtual Instrument, at
http://www.fxpansion.com.
Its sounds are in my opinion from the best i've heard. Been using it with my Nuendo setup for quite some time now, and i'm very pleased with it. It's a hybrid virtual instrument, for windows and Mac, with a lot and great quality sounds. You can download the demo if you like and test it your self.
Hope i've helped, all the best in your work and good luck.
Nikolaos Tsimpetonidis
