Reply to Good .WAV to .MP3 Converter?

Hello guys

i've been looking for a good converter to change the bootlegs and mashups i make in ableton, but i have no idea what i'm looking for. I was using iTunes but i noticed a lot of sound lost, then i began using Switch converter, it was better, but you still lose quality. I'm wondering what you guys use to keep the sound as phat as possible?