Tier 1:
Embolden Potency (+10% per upgrade)
Rune Potency (+1 dmg per rune per upgrade)
Lunge Recast (-6 seconds per upgrade)
Enhancing Magic Duration (+10% duration per upgrade)
Swordplay Duration (+15 seconds per upgrade)
Ward Potency (+10% potency per upgrade)

I'm not going to bother with Tier 2 yet