The best to me is Mother 3. Even barely understanding the text, it was awesome. (The fan translation is almost done by the way.)
After that I'd probably say:
Mother 1 & 2 (Complete Mother 2 fanboy here.)
Golden Sun 1 & 2
Fire Emblem and Fire Emblem: The Sacred Stones
Both Zelda games
And um, probably more, but no list compares to mine :3 Lol.
The Mother 3 Fan Translation is done! Everyone go get it right now! (Mother3.fobby.net)
Play Earthbound for the SNES ; ; Do it, it's awesome!
Proud participater of this year's Wii Secret Santa event! Hopefully you'll join the merriment next year!
Link below because I fail at embedding urls.
http://www.vgchartz.com/forum/thread.php?id=51169&page=1