On my pale masters 2nd life, I have to take heighten and quicken as wizard class feats at lvls 15 and 20. Which one is more important to get before cap? I used quicken only on dancing balls and NEB on my first life, so I assume its safe to take it at 20? Or should I better use my feat swap after getting lich form and get quicken at 18, swapping out mental toughness?