I played with Zedge for over a year now, & i'm pretty impress with this app.
i use it pretty much for everything in my phone.
2. Personal Ringtone for contacts
3. Email Alert
4. Text Message Alert
5. Voice Mail Alert
6. Alarm Clock
all in different characters application, very user friendly, type in any sound, music, even funny characters as well. on top of it's FREE!
it will also ask you where to put the alerts pretty COOL App IMO