Ys3 and particularly Ys7 are FANTASTIC top down action RPGs. I give these 2 the strongest recommendation. The music is fantastic, the graphics are nice and the gameplay is very fun. I personally think they’re more fun than God of War and I think God of War is actually already quite good. So definitely go for those as well.
Also by Nihon Falcom (the guys who made Ys) is a series called The Legend of Heroes Trails in the Sky, but I haven’t gotten to it yet. I want to and intend to but I can’t comment specifically.
Tactics Ogre is a fantastic remake of the original. It corrects many of the original’s problems (first and foremost removing the need to grind). If you like tactical RPGs, you’re in for a good 100 hours with the sheer amount of content in this game. If you’ve never played this before, definitely get it.
The FFT remake is very good. I find the PSP adapted soundtrack is about 95% as good as the PSX’. The cut scenes are nice. The only thing that bugged me is that they added a bit more content to Delita’s backstory to make him seem like a nicer person. I thought this was unfortunate because one of the things I loved about Delita in the original (which made it controversial) was this nuance and grey to his character. He wasn’t clean and I felt that added depth. Other than that, the game’s great. They didn’t alter the gameplay to make it less grindy like they did with TO however… But I never really had to grind in FFT anyway. I could finish the game at level 25ish, though in part that’s because I know how to break the system.
I’m glad you got Wild Arms XF. I personally loved the game, but I understand that it is a polarizing game. Its part puzzle part strategy and the unusual nature of the combat gives it a steep learning curve. I felt it was a really interesting way to convert everything about WA and WA gameplay into a strategy game. I thought the music and graphical style were amazing. The story dragged on a little towards the end, but it was good. If you’re used to Wild Arms, then you have an idea of what kinds of things to expect.
I found FF7 CC to be a pretentious, non-sensical disaster that didn’t explain anything. The graphics were pretty but the environments were heavily recycled, a bit like in Dragon Age 2. FF7 AC is all style, no substance. So you’re warned about that.
I started Metal Gear Peace Walker, but never got around to finishing it. Its classic hideo kojima metal gear with terrible gameplay because of the limited PSP controls. If you like MG ala Kojima, you’ll like this. Not quite sure why you’d want portable ops over that.
If you really want to play lunar, save yourself the headache and play the Working Designs versions. They’re the best. They were released on PSX.
Edit : if you’re a fan of the series, Valkyria Chronicles has a couple games on PSP, though I haven’t played them. I read they were more like the anime than the original game, which meant with more teenage drama. It made it lower on my priority list.