Get the Firenze ticket. Last year it was 72 euro for 3 days. It cuts the lines. I bought it for just two days and we saved a lot of time not standing in line. It covers the Academia and the Uffizi as well as more things than you can see in the time. We got there and went to the Academia and stood in line for about an hour. The next day we bought the Firenze ticket and got to go straight into all the museums including the Uffizi (and the dome at the Duomo) that had a really long lines. (You can also , I think, buy individual tickets ahead of time, but we didn't do that.)