I rate Zaha. Didn't have the best of seasons but he's quick, creative, can score and play across the front line. Only four goals last season, but a total of 26 in the previous three. Also plenty of assists. He's fouled a lot because he's so hard to contain.
With Zaha added to James and Doucoure the midfield can suddenly score 25-30 goals a season instead of about 5.