AAA (which you already like Thank God or we'll be having another noddle war!
)
For guys you should check:
w-inds. (especially their older stuff and definitely Paradox!!)
NEWS (And yamapi's solo Daite Senorita)
KAT-TUN
abingdon boys school
Koike Teppei (and WaT too I guess but I think Teppei's better on his own)
Gackt
For girls:
IVY (K-Pop)
Jolin Tsai (she's a C-Pop singer but she's really good, find Agent J
)