As you seems to like PS1 games I'll let my top 3 RPGs on the system as a recommendation if you still didn't played it.
The Legend of Dragoon
Digimon World 3 (might wanna try Digimon World first).
But unless you have a PS1/PS2/Original Model PS3 and a lot of money, The Legend of Dragoon is the only one on PSN.
You can emulate them, but I dunno if that would be the best way to experience them for you.
Awesome those are all games i havent played yet! Ive obviously heard of diablo but I never got around to playing it. Ive also played other digimon games but not that one. For legend of dragoon, I feel like ive definitely heard that name but i dont really know what its about. And ill have to research more about where i can get these games, seeing as i have a ps1 and ps2 still. Unfourtanetly,If i cant find them or theyre unreasonably expensive i guess ill have to emulate them. D:
All of them will probably be really expensive if you want a good condition original version of them. Digimon World I'm not so sure but both LoD and Diablo can be REALLY expensive. Diablo might be cheap on Steam though and LoD is cheap on PSN.
If you don't want to pay a lot and are ok with emulating, well them go for it, but if you like the game try to pick a version of them after it.
You should love LoD if you love FF7, they do have things in common and should be about the battle system, some love, some hate.
Diablo evolved a lot since the first, but the first still have the best feeling by far IMO.
And,if you like Digimon you should love it. See something about the new game (Cyber Sleuth), that will give you a good notion about how is Digimon World. Digimon World 3 is different but damn it's so good!