Do Arsenal Need to Buy a CDM? Arteta Compared to Premier League Rivals

There have been a lot of reports linking Arsenal with defensive midfielders over the past 12 months, including players like Fellaini and Bender among others. I believe these players would generally be great signings, but I'm not sure if Wenger would spend money on that position when there are other areas to strengthen. In my opinion Mikel Arteta had a great 2012/2013 season.
I decided to compare him to the other defensive midfielders in the top 5 of the Premier League. I chose the players by checking who played the most in defensive midfield for each team respectively. Eg. Yaya Toure played at CDM 8 times, compared to Barry's 16, therefore Barry was chosen. I wanted to include Fellaini, but he did not play a single match as a defensive midfielder, he only played as a central midfielder and attacking midfielder, if you would like to see his statistics, you can look here. All statistics are from whoscored.com and are for the Premier League only.