I can't find any drum sounds I like in SI DRUMS (I have studio X2). Any suggestions? I want ones that are god for hiphop (old eminem style and modern slaughterhouse/hardcore rap style)
Thanks, it really savestime. 
Also, can I put my own sounds into the/an instrument? I tried dragging it from the browser to the screen but since each file is just one drum sound it's impossible to move it around or position properly. Can I like load it into SI or something?

First this is the forum for 8.5 and older version of Sonar, There is a X- forum at the top of the list on the "All Forums" page. 

Session drummer has samples of old 808 drums,,, I think that's what your after, And yes you can roll your own too.