My sister had great reviews of a seafood buffet called Angel's, located, I believe, at the Holiday Inn on Route192, just outside the gate.
Crab legs, lobster, etc. - $19.99.
Here is a link to the "Best Off-Site Restaurants" thread, which is in the section at the top of the main page of this forum. It gives you six pages of off-site restaurant opinions.
I hope this helps. BTW, my favorite off-site restaurants are Sweet Tomatoes (reasonably priced, casual) and Seasons52 (a little on the expensive side, nice couples night out).
Orlando Ale House on 535 (wish we found this sooner)
Bahama Breeze on 535
Landry's was good on 535 as well but $$$$$ But they did let us split with no extra charge
Girodano's on 535 past the Ale House