Sorry for the double-post.
FE6 is the direct sequel of FE7, and is the only untranslated GBA FE game. I don't think most people would enjoy swinging around "鉄剣"s.
Choose FE8, it's the simplest of the three and the easiest of all the FE games due to general consensus. It's the best one for all the SRPG amateurs out there, and its story is pretty damn simple, even for an FE game.
Again, we could leave two options, for those that don't want to play SRPG. I've been constantly suggesting Klonoa for that second option.