However I'd like to try Darkfall
Don't bother, DarkFall is boring. Vindictus is your best bet right now.
In DarkFall, as a beginner, you will either get raped early on by stronger players and get all of your gear stolen over and over again, or you will be harvesting materials for hours on end to make meager money and you will occasionally be owned by stronger players hoping to steal everything you have.
When you are actually fighting, it's fun for the first 15 minutes, but then it gets very boring very quickly. It's as repetitious as all of the others.
The only one that hasn't been horribly repetitious so far has been Vindictus ; P.
Rift looks promising too, but haven't tried it.
edit
in-game screenshot of first boss in Vindictus
Here is second boss
And a fight with bear
Here is video of boss 4 fight
You can see some of the top rated MMOs here
http://mmohuts.com/gamelist?sort=desc&by=rating
Vindictus is towards the top of the list. Another great one is Savage 2, but it's more like an Hack n Slash RTS MMO (not an RPG).