well by the games end

1. S Hydra - Fairy L Barrel - Sniper Scope - Power Booster B - Thunder Materia
2. M Cerberus Y - Fairy L Barrel - Gravity Floater (i think) - Power Booster B - Thunder Materia
3. Blast Machine Gun - Fairy L Barrel (what i really like the barrel) - Gravity Floater (i think) - Power Booster B - Thunder Materia

then i sold some stuff and re did a chapter and got Ultima Weapon ^_^