I remember when I first came across Ars Magica. While the system didn't excite me the setting was awesome. A faux Europe where magi held the true power. My players didn't really like the idea of exchanging roles between adventures so we didn't get more than two sessions in before it all fell apart, but its always held a special place for me.
Well, now you can get all you need to kick off an Ars Magica campaign for less than 15 bucks. If you want to go full on, its a hair less than 27 for the larger collection.