Do not miss SeaWorld, give them a chance and some credit for moving away from theatrical Orca shows. I'll leave it at that and spare you from one of my long lectures on this issue
(although you're more than welcome if you'd like
Mako is largely recognised as the best coaster in Orlando so that alone is enough of a reason to visit
There is a really good value ticket that includes Busch Gardens, SeaWorld and Aquatica for 2 weeks and includes free parking. (which at $20 a go can save quite a bit!) You'll be able to find this on Busch Gardens' or SeaWorld's website.
I'm very familiar with the SeaWorld family of parks so if you have any other questions don't hesitate!
(Just a side note, Christmas Celebration at SeaWorld is without doubt the best in Orlando, I'm so jealous of you visiting in December!)