Hi Robr-I hope you are feeling better!! We are flying Jetblue out of Boston to Orlando in April for $250 per person roundtrip. I like that it is a direct flight.
I was looking around for flights in February & JetBlue had vacation packages (not during Presidents Week but before and after) that were really reasonable. I priced it out for myself and 3 kids (12, 10, 6) & it was going to be $1100 with flights/onsite Value hotel....did not include dining or park tickets. If the price is causing you to

then maybe you should wait a year and space out buying park tickets from
AAA. They have a small discount on tickets and you could spread out that initial sticker shock. I find the park tickets to be the most costly. If I go in February with the kids....big IF...then I will get us Annual Passes & make use out of them every time I see cheap flights out of Boston or Manchester

. We are Disney Crazies, though

, so I love being there.
Timing is really everything in making a Disney World vacation. I loved when my kids were little and I could pull them out of school---can't do it any longer, my son has decided. He doesn't like missing the work, making up the work, and the guilt he feels. Now, we can't take advantage of January/early February... I have to revolve around the school calendar. Your children are young enough to miss school (totally my opinion...others will definitely disagree).
Keep checking the Disney site or ask a
travel agent ( we used Small World Vacations for our cruise planning & were very happy) to help you. If you have a AAA membership, you could go there and talk to them.
I think Disney requires only a 20% deposit so you could start paying small amounts now for a January 2013 trip (it will still be magical) & surprise the family at Christmas 2012.
Avoid Martin Luther King, Jr weekend in January. Early December is nice, too, with the decorations up, but the crowds much more tolerable than Christmas week.