dzekos an unbelievable player, well worth the 25m you'll need to pay for him. is superb in the air aswell. i was trying to build my current liverpool team without big signing like him but then wolfsburg offered him to me for 10m, couldn't exactly say no to that!
i've never had robinho before but i've heard he's amazing, that being said he's known to be a little inconsistent and moody. dzeko would be the safer bet.