I dont necessarily think goals are our problem. We scored exactly 2 goals less than Chelsea last year.
Our problem was conceding at the wrong times. (City at home after taking the lead and then allowing them to score with 7 mins left, Swansea away allowing 2 goals in the last 15 minutes to squander a lead [or Gomis in the 85th minute at the Emirates], Skrtel in 7th min of ET away v. Liverpool, a late Kane goal away v. Spuds)
Maybe (if this is true), Cech can help us with that. We take full point from most of those matches, we are much much closer to Chelsea in the end (and in second ahead of City).
I still think we'll bring in someone up front.. but our defence has been the death of us for a number of years.