Samsung SCH-A950

Hi, I just recently got the SD card for this phone and have already put sonme mp3's on. I am trying to put some ringtones on the phone via the sd card. I searched this as well as the howard forums and found some ways to do it, but the sound of the ringtones doesn't come out that good. I used the method of MP3-->Wav-->MP3 encoded wav-->renaming to mid. Some ringtones sound ok but some are preety bad.

Does anyone know how to got good sounding (real music) ringtones using the sd card? Thanks in advance for the help.