With Ronaldo carrying the mantle of chief-goal-scorer for Madrid, Suarez might be the better option for them compared to Cavani. Think, Suarez will also cut down on some selfishness if he is around better players. Also, he'll come quite a bit cheaper than Cavani.
If Isco to Madrid is done, I don't think, they'll go in seriously for Bale, luckily for Spurs.