Recomendations...this may be difficult folks!

[m-a-z-e]

Okay..so..I need to hear some different artists and I am finding it extremely difficult to discover any so I was wondering if you guys could help. Here is a list of artists I have already tried out:

Ayu [Duh!]
BoA
Koda Kumi
ELT
DAI
day after tomorrow
Rina Aiuchi
Kuraki Mai
aiko
Aikawa Nanase
Sowelu
Rie fu
SOUL'd OUT
Heartsdales
Namie Amuro
Tamaki Nami
Gackt
Hyde
Dir en grey
Malice Mizer
Morning Musume
W
Goto Maki
Aya Matsuura
hitomi
Yaida Hitomi
Hitomi Shimatani
Mika Nakashima
Onitsuka Chihiro
MISIA
Ai Otsuka
H/\L
SweetS
Nana Katase
ORANGE RANGE
m-flo
LISA

I think that's alot of the popular artists..so now I don't know who to try out! Recomendations from any genres of JPop are welcome! Just gettin' bored of the same old..same old..