Ohh finally a topic I have a slight clue on, lol
NES:
Zelda 1 and 2
Final Fantasy 1,2,3
Dragon Warrior
SNES:
Final Fantasy 4,5,6 (6 is probly my favorite of all, although 5 is really good too)
Breath of Fire
Secret of Mana
Seiken Densetsu 3 ( aka Secret of Mana 2 ridiculous graphics for the SNES... sniff sniff)
Chrono Trigger (You have to play this if you haven't already)
The Legend of Zelda: A Link to the Past
Arcade:
Hmm can't think of any.
Genesis (didn't really ask about this, sorry);
All the Phantasy Stars
All the Shining Forces (Didn't like the Shining in the Darkness games.)
I forgot to sleep/blink for like 2 days playing shining force when it first came out. FF 6 and Chrono trigger are probly the best RPGS ever. Although if you haven't played Shining Force or Phantasy Star 4 I would suggest doing that.