Congrats on your new addition!
Since your son will be around 4 months at the time of your trip, I think you'd be happier staying with the Quattro. He's going to be sleeping a lot at that point, and you'll be happy you have a good recline ability and an awesome adjustable sunshade. Plus you yourself will enjoy the huge basket underneath!
The downside of the Quattro, of course, is that it will be big and heavy. But there are tradeoffs like that in strollers, and I think it's pretty important to have a nice comfy stroller at 4 months. For me, personally, that would outweigh the size and weight factors.
One other thought - if you don't want to take your own stroller, you can rent a Graco Quattro from A Baby's Best Friend. (
www.abbf.com) I haven't yet used them personally, but they get nothing but rave reviews around here. We're using them for our September trip.
Have a great trip - and I think you're going at a perfect age! Your little guy won't be mobile yet, and will be happy to spend most of his time in the stroller. Also consider taking your favorite type of baby carrier, since you won't be able to take a stroller into line.
Have a great recovery . . . hope you get some sleep soon!
Disneyfriend