I'd vote for a drive up to St. Augustine too, it's seriously one of my favorite things in Florida. It's the oldest city in the United States. On the beach, you can see the Old Fort, and there are lots of things to do there. It's probably 2 hours from Orlando.
About the 2nd week of January would one of the best times to go to Universal or Disney. Nicer weather and the crowds aren't terrible (if it's not president's day weekend). We like going in February for the same reason.
Check the
www.disboards.com for research. They have a Universal section to their forums and Disney. I've used them for all 3 of our Disney trips. Also, if you go to Disney, the Star Wars Galaxy's edge is opening this summer, so Hollywood Studios is going to be a nightmare if I had to guess, no matter when you go.