Have you done any from Persona 4 yet? There's a lot of great tracks on there.

So it turns out Fire Emblem GBA has a kickass soundtrack

http://www.youtube.com/watch?v=Lo1fWook83g

Also echoing msg you're in for some dire need of Persona

http://www.youtube.com/watch?v=Mz9wG4sTpWk

http://www.youtube.com/watch?v=6ZrFynuIF9g

Jet Set Radio Future has possibly the weirdest soundtrack of any game ever. And I love every second of it <3

FInally your lack of Shinobi spirit disappoints me

Devil May Cry 3 - Devils Never Cry

My favorite JSRF is The Concept of Love.

Some picks of my own, that are not completely mainstream:
Wizball (C64) - Title - https://www.youtube.com/watch?v=sFYzjU-C3mA
Amplitude - Shades of Blue - https://www.youtube.com/watch?v=PWVKYpwRuOs
Final Fantasy Legend II (SaGa 2) - Wipe Your Tears Away - https://www.youtube.com/watch?v=-C6E7QZBvZw
Jazz Jackrabbit - Sluggion - https://www.youtube.com/watch?v=oBnxP6IVWB4
Myth 2: Soulblighter - Down a Broken Path - https://www.youtube.com/watch?v=pJpvFei4ecs
Treasure Quest - Prophecy - https://www.youtube.com/watch?v=gN0zNqOM3hY
Sacred II - Sacred - https://www.youtube.com/watch?v=5fakNlghOJY
Lotus III - Track 3 - https://www.youtube.com/watch?v=_og9BLNVWYk
Lamento: Beyond the Void - ranbu - https://www.youtube.com/watch?v=dEdW6-GURr8
Championship Baseball - Gamestar Theme (or at least that's what I'm calling it) - https://www.youtube.com/watch?v=67xphWChUr0

I'll stop at 10. Don't want to overload you.

Haha, you added a fade-out effect at the end, too, nice touch.

Can't stop listening to this track from Muramasa, though the whole OST is awesome

MGRR had an awesome OST

Paper Mario is a super charming game, proof:

Dont care much for this games music in general but it's main track is pretty epic

Not a suggestion but I can listen to this over and over, can't wait for the full track

Walking Dead. Dear god this track, one of the most empowering moments I've had in a game

My suggestions:

Morrowind:
It's so iconic. I can listen to this and it instantly brings back good memories from my hundreds of hours in Morrowind. God, I loved that game.

To The Moon:
Can't decide which version I like best here

or

There's also:

Then there's:

Blackwell Unbound:

Which brings us to....

Broken Sword 1:

These two surprised me, as I hadn't expected this pumping out of the stereo back at the main protagonist's apartment (French female). I dunno, it fit so extremely well with her. It's exactly the kind of music I feel like she'd be listening to.

Finally there's Red Dead Redemption:

You hear this one after having fulfilled your job and killed the last bad dude you were after, and having been told to race home to your family since they're in danger (they've been held hostage of sorts by the law since the start of the game)

You hear this one while crossing the Mexican border for the first time.

This OST is REALLY badass

The two best tracks in Hotline Miami

Inner Animal - https://www.youtube.com/watch?v=1yIdAxSNaS0

Knock Knock - https://www.youtube.com/watch?v=KR1SvoPhCVg

The Last Story Toberu Mono - https://www.youtube.com/watch?v=bOJuMhtH9ZQ

Rune Factory 4 - Wind Dragon's Tears - https://www.youtube.com/watch?v=CJOWNLY4nZ0

Rune Factory Frontier - Snowlit Winter https://www.youtube.com/watch?v=_rVVRCJMsIs