Ah ok. You can't change classes. You'll have to think carefully about that.
It wouldn't be practical anyway, because you need to train a lot of things of you class. If you could switch, you'd have to start over a lot of things.
75% (at least in the beta) are normal servers. 20% pvp and 5% rp.
They're basicly all the same... You can also pvp and rp in the normal servers.
But in the normal servers, you have to 'turn pvp on' by typing /pvp. In the pvp it's always turned on.
I think the rp servers are just to make it easier for roleplayers to find eachother. Perhaps they have extra stuff, I don't know.
Edit: I don't know about RAM, but especially when there are a lot of characters on screen, you could use it.
RAM isn't that expensive anyway.... right?
Edit2: +rep for considering WoW.
