Qwiss Yeah I think Nelson might end up being the biggest sale ironically enough. Homegrown, still young-ish, fair amount of PL experience, long history of Arsenal backing him. Fulham or Sunderland could probably offer £30 million. Best case he stays with them, worst case they ship him again. Only real issue is the wages, but it's much less of an issue in Premier League than abroad.
The rest of them are worth £20-30 million max, and most of that value is tied up in Kiwior. Lokonga and Vieira probably unsellable. Let's see what happens though.