You could also have a look at:

* A Perfect World - It's very well tuned, free, has a similar model and is a really fun game to play.
* Sword of the New World - MMO concept, but you play a family in the "Spanish Main". But with guns, magic and so forth. What makes this unique is you play a party of 3 of your own characters at once, which makes it a bit of a management exercise. Quite good though!

And that's enough for me. I need sleep. Busy job is busy and we had a faxing 3 hour meeting with Microsoft today. Tired Tan is tired.