Wow, it seems like we've all been in a retro RPG mood lately. I think the biggest reason why is that barely ANY RPG's have come out recently. It's very few and far between. Anyway, here's my opinion:
Final Fantasy VI is by far my favorite game ever. I have beaten the HELL out of it more times than I can count. Hell, I can probably quote most of dialogue. Haha. Now, that's not to say that you should pick it up immediately. Out of the few you're jumping between, you might want to set it aside, but you NEED to come back to it. Give it some TLC and you'll understand why it's the best in the series. :)
Breath of Fire 3 is a fantastic game with some good characters and a good battle system but like everyone else said, it's incredibly hard. I got stuck, and I mean STUCK. To a point where I just couldnt bring myself to continue because i felt there was nothing else i could do. if you can get past that part though, more power to you. :)
Wild Arms 1 is iffy to me. I played the first one back in the day and liked it enough so when the remake, Alter Code F, came out, i was all about it. But even then, my interest started to lack a little while into it. But i will say, out of the 2, I would prefer the remake. The updated graphics and battle engine are refreshing. I'm actually playing Wild Arms 2 as we speak. Another one of my favorite games ever. :)
Lunar has been remade more times than i can keep track of, but the story is something to keep you into it. It's just fun. I played the first one on PSone a LONG time ago and loved it. I've personally never gotten around to playing any of the remakes though. Lunar 2 in another incredible game. :)
Trails in the Sky was a MUCH better game than i anticipated. I got bored after the first 2 hours but i stuck through it and LOVED it by the end. Great great story. And the fact that searching empty treasure chests prompted a new response EVERY single time was just genius on the writers' part. :)
Tales of Symphonia. Yes. As I'm sure you can gather, I am a Tales Of nut. This is the one i would recommend. It's not my favorite Tales game. I personally think Graces, Abyss and Vesperia are better...in the order. But it's still a fantastic game. Good story, battle system thats never boring and fun characters. And if you are already so far into it, it has a good ending. Plus, you may learn to LOVE the game and want more Tales....which there is plenty of.
Sorry for the long response, its just all these games are pretty close to my heart. haha. :) ENJOY WHICH EVER GAME YOU END UP WITH!!!!