Dude, never gem for spell penetration. Even stamina has more use in PvE than penetration. Don't gem for pure crit either, spell damage is still awesome.
I'd say you should stick with Potent Noble Topazes and Glowing Nightseyes (if the socket bonus are nice) till you can start going pure Runed Living Rubies.
Also, never enchant mp5 or crit, or intellect, except for teh shield, which you'll want the badges one as it will last you till Archimonde.
And if you crafted that helm you can also craft
this one. Or you can wait for Prince's Dagger.
Gratz on teh kilt tho. I had to go Exalted and beyond in order to get it myself.
Lasts till Zul'Aman so keep it.