Any set that gives 1 piece max magicka. (Infernal, groth, llambris... )get a head and shoulder of either set and make sure one is heavy and the other med so that you can capitalize on the undaunted passive. this should toss you above 40k mag
Just 1x parts - as Irylia mentioned.. for whatever stat you want to round off your build.
Minalan owes me a beer.
PC EU Megaserver
Minie Mo - Stam/Magblade - DC
Woody Ron - Stamplar - DC
Aidee - Magsorc - DC
Notadorf - Stamsorc - DC
Khattman Doo - Stamblade - Relegated to Crafter, cos AD.
I like Infernal Guardian. Obviously it's kind of worthless vs ranged people, but it deals a fair bit of dmg on people in melee range where they are a lot harder to dodge.
It'll also leech some AP for you if you're into zerging, i suppose