Suidoken IV, Star Ocean til the ends of time, Robot Warlords (as close as the ps2 gets to the awesome front mission 3, bloody difficult though to master however), Ring of Red (dated but good mecha strategy game, was one of the first releases for the PS2) I think it's got the initials S.L.A.F. for it's title on the ps2 but essentially Konami ripped off Phantom Crash which was an excellent and under-rated Xbox game where it becomes Armored Core 4 meets Gran Turismo, objective is to buy a mecha and compete in tournaments progressing through the storyline as you go and you get the options of upgrading your mech, light for less armour more speed, heavy for slower but harder to kill. I never played the PS2 version but from what I can tell it's exactly the same bar the menu system. GTA 3 since you've done Vice and San Andreas. GTA stories games unless you've played them on the psp are probably worth a bargain bin buy.