At low levels I'd only use 'of stamina" or 'of the eagle.'
Or nice blues.
Spell damage doesn't make sense until very high levels, imho.
The exception is a bg twink lock. I've seen a few who can do some nasty shadowbolt crits, and they do it w/ spell damage gear and enchants (and if over 30, with the talent Ruin). They are mostly, however, getting their +spell damage from enchants. Very expensive ones, I might add. (they can also be mean little afflock-drainers in bgs, w/ lots of spell dam). GL