Anyone play WoW?

[INTRIGUED]

How much does this cost each month? I downloaded the trial a few days ago and I could actually see myself getting hooked on this.. I've never really been into these games ever but after even just getting my little warrior dude up to level 8 I could see myself getting a big evil grin getting him to even the 20 range. Quite a bit of walking though is one thing, Nature of the beast though I guess. Once we get into the house and I get the new computer I'd like to plant my butt in the chair and jam away at this. Providing it isn't to much cash of course.

Also the expansions, I notice there are two different ones. Should pick them up as well? This the time of game that if you don't have these your not "in like flin" according to the rest?