Oye! Well all of these albums came into my life at special times and therefore all hold a special place in my mind.
Everyone thinks AROBTTH is the best, but I personally prefer Parachutes, followed by X&Y, Viva la Vida then AROBTTH.
They are working with Brian Eno, who contributed to Viva la Vida, so I think this new one will be a solid one as well.
And for the record, I loved Fix You before it became "cool"