You know, I like your idea only because it has me going twice in a row!
Honestly, I don't know what we'll be able to afford, and depending on how progressive this little one is, my feeling was, taking a two year old could be easier. There's the potential that they're potty trained, they're on regular food, and they do get more at that age. That was a great age with my son, but every kid is different.
Oh money, shmoney, with two kids you'll be broke for the next thirty years regardless. Regular food is a huge plus, I forgot about that. My kids were not easy going at any age - 2 and 3 were particularly difficult years. Heck, 12,9, and 6 aren't smooth sailing either. But that's just my neurotic family. I'm just trying to enable you into writing more trip reports!!!
And MERRY CHRISTMAS!!!! (I'm dising because I'm trying to stay awake longer than the kids - don't want Santa to fall asleep on the job!)