You can't pick them on the peak performance of their career, you have to pick them on their performance at the Phoenix - which means no Rojas or Kosta for me (although that will hopefully change this time next year).
If you did pick on peak performance then your team would have to include Ahmend Elrich and Tony Warner. Heck Pantelis would be reasonably high up on the list (although not top ten) despite the fact that with his two seasons at the club he never played a game (poor guy).