Going to settle on this build:
Finesse
Precise Weaponry I: (Rank: 2 / 3)
Dagger Mastery: (Rank: 4 / 6)
Precise Weaponry II: (Rank: 2 / 3)
Faeblade Mastery: (Rank: 6 / 6)
Sorcery
Arcane Weaponry I: (Rank: 3 / 3)
Sceptre Mastery: (Rank: 6 / 6)
Staff Mastery: (Rank: 6 / 6)
Storm Bolt: (Rank: 6 / 6)
Arcane Weaponry II: (Rank: 3 / 3)
Chakram Mastery: (Rank: 6 / 6)
Sphere of Protection: (Rank: 6 / 6)
Mark of Flame: (Rank: 5 / 5)
Conservative Casting: (Rank: 5 / 5)
Summon Faer Gorta: (Rank: 1 / 6)
Healing Surge: (Rank: 5 / 5)
Chain Lightning: (Rank: 5 / 5)
Ice Barrage: (Rank: 5 / 5)
Arcane Weaponry III: (Rank: 3 / 3)
Transference: (Rank: 1 / 5)
Sphere of Reprisal: (Rank: 5 / 5)
Smolder: (Rank: 5 / 5)
Frostshackle: (Rank: 5 / 5)
Arcane Weaponry IV: (Rank: 3 / 3)
Elemental Rage: (Rank: 5 / 5)
Tempest: (Rank: 5 / 5)
Sphere of Retribution: (Rank: 5 / 5)
Meteor: (Rank: 5 / 5)
Winter's Embrace: (Rank: 5 / 5)
Primarily a mage character. There's a lot of stuff in the the Sorcery tree that I'd rather not have added points to. For example, a single point in Healing Surge seems more than enough and I don't like summon spells in my mages and I don't think I will be using Sceptres much to justify the full six points. However, I needed the 109 points to reach the highest mage destiny and had no choice but to put points in a lot of abilities I'd rather not have.
I would have went for a mage/rogue hybrid destiny but the Sorcery tree has too many stuff I want that requires 70 points invested in the tree. Since you only get 123 points to mess around with, trying to get the highest tier skills in any tree while playing a hybrid build would mean that you would need to forego reaching the highest tier destiny available to your class (the two-class hybrid destinies require 55 points investment in each tree to unlock the highest tier destinies).
EDIT: For those wondering where you can plan your build, this ability calculator was posted by someone else a couple of pages ago.