Running on my Magick tank I started to wonder what the difference for spell power is to my actual Magicka skills? Been debating if it is worth using a flame staff if I'm not going to use its moves
If you want to run something that buffs spellpower just for the spellpower buff, go DW/2h. They give a much bigger buff than staves because logic>.<
That said, not sure how much good it'd do you as tank who I assume isn't stacking spelldamage otherwise. You can always test it yourself though;)
Well in that case you could try DW for spelldamage+the usual DK stuff, Whip+DoTs. Most stuff is currently rather forgiving so you could probably do some dps at least while still "tanking".