Gotta be Landstalker. That rocked. 🙂
Shining Force I was good. Something about Sword of Vermillion (which, by the way, you really should play with the official full-color hint book) stuck with me and made me seek it out on eBay years later...
Starflight was an interesting twist on the RPG flavor with Sci Fi thrown in... PS2 and 4 were very good...
And, just to be difficult, I'll thrown in a couple obscure ones that I beat 😉
- Light Crusader (late entry, but it gets addictive)
- Beyond Oasis (only partially an RPG, but I really loved being able to beat the snot out of the monsters)