For zeny, people are gonna say Blacksmith or Rogue. I've tried with a Rogue, stealing cakes and all, but it got really boring really fast. You could try it though.
I think Crusader might work too. I don't like swordy classes so I don't know all that well. But you can kill mobs in Prison and Niff, just party with a Blacksmith and share half of the loot, or dual client your own Blacksmith to greed for yourself. You just gotta, you know, live. xD
For fun, you could go Wizard or Priest. I'd say Priest only cause that's my favorite class to play haha. You can join people in party's and level together, explore dungeons, or whatever. If you prefer solo play though, then you could try Wizard. You can kill almost anything, just get a decent cast time. ;o
I've given up on A LOT of classes because they get so boring for me after a while. I can never get tired of Priest classes though.
