Im playing as chelsea in my fm12 the players i am thinking of gettin is : alexander buttner, cesar azpilicueta, kevin mirallas, bale, matt jarvis, leandro, gaston ramirez, scott sinclair, mathieu debuchy, moussa dembele, adam johnson, edinson cavani, yann m'vila, santi cazorla,
Alexander Buttner - Amazing in real life, not sure it is replicated in the game. You will be better off purchasing someone like Lucas Digne (younger and surely good enough to replace Ashley Cole by the 2nd season).
Cesar Azpilicueta, Debuchy - I tried, but his agent is a money-wh*re. Since you are Chelsea, you might not have as many restrictions as I had while trying to get him, so go ahead. He is a great RB, and definitely should be much higher up your possibilities than Debuchy.
Kevin Mirallas, Leandro, Gaston Ramirez, Carzola - I've never bought them in a game, but heard big things. Just make sure they are not all smoke but no fire.
Scott Sinclair, Jarvis - This is a real step down, if you ask me. You have much better players waiting in your reserve team than Scott Sinclair. When I was managing Swansea, Sinclair wasn't even first-choice there. Jarvis is pretty similar to Sinclair's ability. Also, with Hazard in your team, where will you play them? You can't drop Mata either.
Dembele - He could work. He has gotten a great attribute boost in the new update, but he won't be cheap. Get ready to pay.
Adam Johnson - NO!
Edison Cavani, M'Villa - Proven champions in the game. If you can get them, don't even think about anything/anyone else.