Omni Championsgate - Where is the best place to book?

[cjc]

Hi
After much research, umming and arrrrhing I have decided we would like to stay 2 nights at Omni in August next year.
Who have you booked with to get the best price? Any suggestions on deals you may have secured?

So far thomson/Firstchoice (hotel only) are offering £178 including free Americal Buffet Breakfast for 2 adults and 1 teenager for the 2 nights.
Do you think I can find better? Omni direct were quoting $127 plus tax per night, excluding breakfast.
I am aware I will have to pay approx $15 resort fee per night on arrival.

Thanks in advance
CJ