Found an awesome website last night after trying for like 3 hours! I can't believe that they make it so hard for you to edit songs for ringtones for your blackberry! I found a website called:
Myxer - Download Ringtones and More. On this site you can register as a musician and it will let you download songs from your computer and pick whatever segment you want to use as a ringtone. Also it emails it to you to download and you don't even have to connect a USB cord to the computer or anything. Way easy! After you have received it on your phone, you just save it as a ringtone! Don't know why this website is not more known for blackberry users, or any mobile phone user for that matter. It's so easy and works great!