If you're going to look at it that way (and I recommend we do), you also need to account for the mana that would have been generated by the spells you're not casting during the combo. This puts the effective cost of a full melee combo at about 163 mana, as the melee combo expends 160 and generates 35 in the time that you could have generated 38 mana by casting spells.
It's funny that you use Verraise as your example, because Verraise is the one spell that's actually in a better position now.
But anyway for anyone who wants it, here's a comparison of our costs pre-/post- ShB.
Code:Spell SB cost SB cost% ShB cost ShB cost% Change Jolt 360 2.500% 300 3.000% +20% Verstone 360 2.500% 300 3.000% +20% Verfire 360 2.500% 300 3.000% +20% Veraero 480 3.333% 400 4.000% +20% Verthunder 480 3.333% 400 4.000% +20% Verholy 600 4.167% 500 5.000% +20% Verflare 600 4.167% 500 5.000% +20% Scorch ---- ----- 500 5.000% ---- Vercure 600 4.167% 500 5.000% +20% Scatter 480 3.333% 400 4.000% +20% Verraise 3600 25.000% 2400 24.000% -4%