To imbue or not

Pretty good Mage start with a +3 projecting spear (ghost gift), a +3 leather armor of brimstone (no SoU spent on them, only stone and stylus) and Unstable Spelbook. Now I am considering to imbue but I am no fan of fireblast or disintegration tbh. I should have taken the Blast wand for that... What would you do? Go with the flow and FIRE away?