Are you staying at Disney? There's really nothing else in the area that is going to compare to the ambiance and quality to the Restaurant Row eateries.
One of my favorites on Sand Lake is called Seasons 52.. It's a little bit cheaper than some of the others, as entrees are all $16-26. The atmosphere is beautiful.
Pharmacy is another really cool restaurant. It's a modern speakeasy; it's even hidden behind a faux elevator door. Really great locally sourced menu.
A new restaurant, Slate, is getting really good reviews too.
If you are willing to drive further, Winter Park is a gorgeous town north of Orlando that has some of Central Florida's most celebrated restaurants. Luma on Park, Prato, Ravenous Pig, and Cask and Larder are just a few of the critically acclaimed restaurants in that area. It's worth the drive just to check out the town, which has a walkable downtown area.