I'm not so sure a goalscoring midfielder is a priority. With Benteke Weimann and Gabby scoring on a fairly regular basis, by having a midfielder bombing forward as well we will be wide open on the counter and end up letting even more in.
Despite our good run in the last third of the season, against the better sides we were often too deep and the strikers got isolated. I think that's why Lambert played N'Zogbia at places like Old Trafford - to bridge the gap between midfield and attack. Our strikers will score goals, but they need the midfield close to them in order to do that.That having been said, we do need more goals from the midfield and the rest of the team anyway.
Apart from Gerrard, lampard, Michu (frustrated striker) I don't know of many free scoring midfielders, Even manure struggled from midfield last season, I could be wrong of course as this is just off the top of my head