Suikoden, absolutely.
The first 3 and the 5th are good enough to outweigh the mediocrity that is IV and the sin that is Tierkreis. I can't comment on the latest PSP game, but I don't hear good things about it.
Final Fantasy could be a contender, but it's really too hit or miss to be a top contender. For better or worse, Final Fantasy tends to hit the extreme ends of the scale for me.
I love me some Lunar, too, but with only 2 real games in the series and with the latest remake of Silver Star leaving me feeling like I just ate a thing of cotton candy sprinkled with sand, I can't rank it higher.
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"Filthy lawbreaker, unhand that vending machine!" - Casey Jones