So I read through the other posts and summarized it to this. Thanks to all who posted the information.
SWTOR nodes in grades and locations
Grade 1 Coruscant (Rep), Dromund Kaas (Imp)
Grade 2 Taris (Rep), Balmorra (Imp), Nar Shaddaa (Both)
Grade 3 Alderaan, Tatooine
Grade 4 Balmorra (Rep), Taris (Imp), Hoth (Both), Quesh (Both)
Grade 5 Belsavis, Voss
Grade 6 Corellia, Ilum
Grade 7 CZ-198, Makeb, Oricon
Grade 8 Rishi, Yavin 4 , Ziost
Grade 9 Darvaniss, Zakuul
Grade 10 Iokath, Ossus, Umbara, Nathema
Grade 11 Onderon, Mek Sha
I just wished the newest posts would show up first and not the outdated ones :/