I checked out Miss A's discography. Only title tracks I use are Hush, Touch, and Good-bye Baby. So I downloaded A Class and Touch, didn't bother with the others (already had Hush).
I'm really loving 2PM's stuff. I'm starting with Grown and Hands Up.
2PM's discography is really solid Their album 1:59pm is great too if you can look past the autotune/vocoder/whatever.