Fire Emblem: Path to Radiance. Never got around to the other Fire Emblem games, but I thoguht that one was great.
Advance Wars series: Great & fun turn based combat.
Lord of The Rings: The Two Towers: A great hack & slash game, one of my favorites of the genere. Personally I liekd it more than a lot of modern equivalents. Diablo III had nothing on this one in terms of pure entertainment value, IMO.
Breath of Fire I+II: My favorite Jrpg series, you can turn into a dragon. Both have their enjoyable quirks, and worth the money for sure.
Final Fantasy Tactics was fun, but I could never really stand the plot, or the main character. The Judge system was a roayal pain, I'll say that much. Still, thought it was good, if not as good as the others on this list.