US Airways, Northwest, Continental, United and Southwest all appear to be matching (or, in the case of SW, were in the same range anyway) with fares in the $140-160 US range RT. Sale ends Sunday the 6th and a Saturday night stay and seven-day advance purchase is required; travel must be completed by March 14. US Airways has a couple of direct flights from Buffalo to Orlando (stops in Pittsburgh but no plane change); Southwest has the only nonstops once a day and twice on Saturdays.
Another possible reason to brave the QEW: even at Christmastime (Dec 20), the wait for security in the busy early morning was less than ten minutes. I suspect it's a bit longer at Pearson for US-bound flights.
Happy to hear someone else'll be there in mid-Jan. If you go, keep an eye out for a couple of dazed honeymooners...
Andrew