Do I really need se530s?

So i've been looking at Shure se530's and wondering whether I need them..

 My music is in MP3 file, some in AAC, MP3 is up to 320kpbs...

So do I really need the Shure se530s or are these for people for FLACs, I download my music (legally) and it comes in MP3 form, soo I cannot rip again into FLAC / AAC, however, some of my music is from CD. 

I listen to Metal / Trance / Acoustic, so a wide range, so do I need the se530s or can I get away with a cheaper pair?