Re: Socket in Stormshield
Since you are starting out the -15% requirement or pdiamond are good choices. Once you get higher up and can start farming runes (thats my fav thing to do by the way), meph, etc. you can try getting an enigma or chains of honor both of which give extra strength. However, if you plan on saving that shield for another toon I'd just socket it and leave it until you know exactly what toon and what exactly you want to focus on.
Build a 2nd sorc once you've managed to get good gear for her you may want to put a jewel fact for more damage/-resists, your lacking on damage reduction ber (ok thats expensive i know), etc.