I created my own magic system because I hated to at least disliked most of the magic systems out there. One of my problems with most of these systems is that they don't match hardly any magic system in any books or movies. Most systems in stories are centered around a certain power or theme and are variations on that. I think that the oWod Mage did come the closest but it was too vague.
I created a series of powers that have a few different levels to them but lots of options. Each spell effect is a feat but for each level there is plenty that you can do.
Check it out!
Nexus Magic Powers - Nexus D20 Wiki
That looks pretty neat, is there a compiled document to DL somewhere in there?