[quote name='Raiikoh']If you can find it, Phantom Dust! The Warriors is also great. If you liked JSRF, some of the other Sega games are equally enjoyable. Gunvalkyrie, Otogi, Panzer Dragoon, etc.[/QUOTE]
Definitely Phantom Dust. I was at TRU a few days ago and they had about 20 copies for $7 or so. Another quirky game I like is Dai Senryaku VII: Modern Military Tactics. It's a turn-based strategy wargame, if you are into those (think Advance Wars, but much more realistic and complex).