I run the same template, its a lot of fun. Definitely go gargoyle since u keep mounted speed with a rising colossus.
Mind blast is the obvious no eval spell but not practical since w/ mysticism u get a stronger/better 100% cold spell (hail storm).
Stone wall and Energy field (used for monster control & to give yourself some 'wiggle' room) are much more useful spells.
You can bump up ur magery a little or I carry a +15 mage spellbook switching out fast just to cast the e-field.
On my template I run with 75 magery and a +15mage jewl so I dont fizzle inviso. I've also got +15disco on the same jewl.
My temp is:
120 disco(+15 ring)
120 music
120 provoke
120 mystic
120 focus
75 magery (+15 ring - mainly for inviso spam while trying to provoke/disco)
60 meditation
720 skills
TBH the only reason I use magery is for the inviso spam that if u fizzle against some stuff will get u dead fast.
If your not running eval almost all magery spells will be worthless. I would carry a high SDI spellbook and
try to fit on as much SDI as possible since there's no cap on SDI in PvE.
Make sure to get the lvl 3 primer discord quest (discord 5 goats LOL) from the Brit Music Conversatory. You'll also get a Masteries book doing it.
Good luck & welcome to the world of barding !