Suarez and Gustavo would put Arsenal right up there in my opinion, whether they happen or not is another matter.
Unless Wenger pulls off some magic in the next few days, he's let ~20 players leave and signed 1, leaving the squad majorly thin going into the first PL game. I always thought he was an intelligent guy, but that seriously doesn't add up.
The coming weeks before the window closes will define his future at the club. Can you imagine if they lose to Spurs (or Villa or Fulham for that matter), don't qualify for the CL and don't sign anyone? All of which could happen before September 3rd. There would be an incredibly poisonous atmosphere around the Emirates.