Definitely get Chrono Trigger for the SNES or the remake for the DS. The remake is the same exact thing, except it's for the DS, of course. xP Also, the remake will be easier to find, and also cheaper. Also, since you like Fire Emblem, that means you probably like tactic RPGs. I would recommend any Final Fantasy Tactics, especially the ones for DS and GBA. Also, Jeanne D'Arc was a very good for the PSP. I know you don't have one currently, but that's just a suggestion for future purchases. xD
Also, Dragon Warrior games are very good. I've played 1-3, which I've enjoyed, and another for the DS. They've all been good games, and the amount of things you can do will always entertain you. From beating baddies in the basic storyline, gambling on monster battles for tons of moolah, to collecting medals from monsters, these games will entertain for several weeks, even to the most hardcore gamer.
And, here's MORE suggestions! >
Final Fantasy 1-10 were all very good games--I am partial to 7 and 8, though. Nevertheless, they're all very good, involving stories that can easily take 30-40+ hours of gameplay each, especially if you get all the ultimate weapons, summons, etc.
As for the SNES, Earthbound, Mystic Quest, and, again, Chrono Trigger are all very good games. Also, one that's a little different, but still good, is Super Mario RPG.
For the PS1, this is where you'll get Final Fantasy VII and up. Also, many of the sooner ones can be purchased as remakes on the PS1, DS, etc. Also, Chrono Cross is a good game you should look at for this console. In fact, it got a 10/10 rating from Gamespot. It is a sort of sequel to Chrono Trigger, although I don't think it's quite as good. xP
Anyway, that's enough suggestions for now. All of these games, provided you get them all, could keep you busy for months, or even years.