BardStephenFox said:Ars Magica is a different game system.
Elements of Magic:Revised is an alternate take on magic in general. Very nifty system, with players that are willing to really do the work and exercise the system. If the players try to learn as they go, I think you will watch the game crawl, crawl, crawl.
Actually, someone called EoMR a d20-port of Ars Magica. He's wrong, (both systems evolved parallel), but this shows the similarities of both approaches. If you like the idea behind Ars Magica, you won't be disappointed with EoMR.
And to the work with players: The update will probably include all cantrips and 1-MP spells, so new players can pick th spells like in the core. Otherwise you have to choose the spell lists and how you spend the precious MP - the spells one should devise between sessions. I don't see it as difficult, after you've succeeded to explain the basics.