sorry for all the random suggestions btw. i just can't stop once i start. ><

tbh i think most of singers out there are talented....it's just a matter of how much we know them to acknowledge their talents. because we don't always watch all their performances n we might happen to watch some less impressive ones n that might seal the not-so-accurate-impression on them. anyway...suggestions huh?

ZE:A xD - don't mind me i'm biased too ;)
http://www.youtube.com/watch?v=rTKJmaVL2-M
http://www.youtube.com/watch?v=4egntkVDcZ8
http://www.youtube.com/watch?v=EZJGxaedtg4
http://www.youtube.com/watch?v=7wccERrHBwQ

A'ST1 - they've disbanded but i'd say they're one of the grp with awesome vocals for idolgroups...and some members are now in vocal/ballad groups.
http://www.youtube.com/watch?v=_r_7aRt9YiQ
http://www.youtube.com/watch?v=XR_-c3Kk4tY
http://www.youtube.com/watch?v=Stf01ejmNfw
http://www.youtube.com/watch?v=c26_UnbbsZA

ChAOS - disbanded too but i find their kiss kiss live performances awesome

Handsome People - well, Tei is an awesome singer.

Kim Jisoo (SSK2 same season with Huhgak)
Jo Moongeun (SSK1 runner up-same season with Seo Inguk) - this guy is awesome he could blow everyone outta water...well, to me...though his after debut music style/image is so gentle n 180 degrees different than his predebut which was fiercer n more passionate

there's a female group Lady Collection, they're pretty awesome n badass with cool songs, but they disbanded too. i'd say Seo Inyoung is pretty awesome too. Nine Muses, though they don't stand out vocally, but as a group they're very strong live singers. here, the main vocals sing in this song with the rappers (they had better perfs i just love this song so...): http://www.youtube.com/watch?v=5o3a48ZmguE
it's hard to suggest Rainbow cuz they hardly get any song that could showcase their singing talent...but i'll try since i love 'em: http://www.youtube.com/watch?v=pLFe8vyfwXE

and i thought Shinhwa's pretty really good.
http://www.youtube.com/watch?v=NvbihEbsrB8
http://www.youtube.com/watch?v=4Ya7pZiktKk

i agree with you on KRYS but sj is talented too XD (dont mind me im just being biased XD)