I'd have to agree with a number of people in that Haste is one of the most useful spells to get at 3rd level. The added power it adds to a tank every round, or the added spellcasting you as a wizard/sorcerer can do, outstrips the damage output of a single spell in the experiences we've had. Nothing like the flanking rogue getting hasted and then double-sneak attacking, or the main tank going in for extra attacks, or the sorcerer artillery battery firing off spells quicker.