$448 R/T per person?!? That's insane! I just did a search on orbitz.com and you could get JFK/MCO R/T departing 12/23/02 and returning 01/02/03 for $185 with American Airlines. Or leave 12/24/04 and return 01/02/03, LGA/MCO, with Delta for $192.
Usually I look for fares through orbitz.com or travelocity.com and then book them directly with the airlines that turns up with the most favorable rate and travel dates/times (sometimes these third party sites charge a service fee).
I wouldn't purchase tickets at those prices unless they are the only airline meeting your flight time needs. The direct TV service is great (especially for the kids or to distract those with fears of flying), but to pay $200+ more for that service on a two and a half hour flight is definately NOT worth it in my book. HTH