Buy a Saradomin Sword and train at bandits, I've heard it's pretty good. If you're looking for a cheaper weapon, there's nothing wrong with Dragon Scimitar, or Brackish Blade. Also if you're looking for a cheaper place to train, try out rock crabs, experiments, ghouls, and spiders in the stronghold. You DO have the option of getting a chaotic weapon, but it'll be a hassle having to repair it, especially if you're botting.