So I've finally convinced the members of my board gaming group to give Pen and Paper RPGs a try for the very first time. We all have experience with CRPGs, a number of which are based on D&D (Baldur's Gate Series, Neverwinter Nights Series, ToEE, etc.), but none of us have ever tried any true Tabletop RPGs. I will be the GM as I have the most experience with D&D in a computer form, and I am the one in our group who always learns the rules of a new game and explains them to everyone else.
So my question is, which RPG would be better to teach first time players and for their first time GM, Dungeons and Dragons 4th Edition, or Grimm? Now I know that posting this question on this forum may lead to some biased answers , but I know that anyone here will have more RPG experience than I do, especially with Grimm. I think Grimm may be the better system to teach as it is simpler and much easier to learn, but do you think it's a good "starting point" to jump into the world of tabletop RPGs with? Or is the classic D&D that started it all a better choice? I don't think theme will be a problem as I believe my players will all like the idea of Grimm, and are at least a little bit familar with D&D in it's computer version. Or would it perhaps be better to get the core books for D20 World of Warcraft setting (something they all play avidly and would be very famiar with)?
I already own the Grimm RPG (it was cheap and I picked it up since it's all one volume and I love the theme and rules), but could probably acquire any of the others pretty easily. So does anyone have any thoughts on this? What would be easy to teach? And easy for someone who has never GMed anything before to do a good job with? If anyone has any tips for the first time RPG group, or about being a good Game Master I'd love to hear them. Any thoughts or opinions would be much appreciated.