Witch is my favorite class in Dungeon Fighter Online. All rare brooms are like 50k DFO gold or less, repair costs are non existent, and their aoes clear normal dungeons with ease. It means you don't need to cost much dungeon fighter gold to reach good condition.
I wouldn't give up on soul bender, they're one of the best pve classes solo or party. If katanas are too expensive, use short swords instead. You'll get more power for less than half the price. If you can save up 900 radiant demon eyes (long term goal lol, think 3 months from now) you can buy the 50 epic shortsword from grandis, currently one of the best weapons in the game. Gotta love that +30% damage.