T.F.
Watters Creek has Mi Cocini, Cheesecake Factory, Brio, PF Changs, Grimaldi's, Cru Bar......... They have live music there on Thurs-Sat on the green and it is entertaining for children.
Hibachi Rock on Bethany is great. We spend more than $50 though. You probably pay $30/plate minimum with no alcohol.
Patrizio's in Plano (Park/Preston) is great.
Macaroni Grill but it's more like a chain.
We eat out a lot and enjoy these places. You can probably get close to $50, at least make it under $100. We've spent way more at these places we we are wine drinkers and order a bottle of wine so that adds to our bill.
When you really want to go to a great dinner with open budget....MUST DO's are: Del Frisco's, III Forks, Lawry's, Ruth Chris, Sullivan's, just to name a few.
Enjoy! Date nights are VERY important...
UPDATE: we went to Shops of Legacy last night. Nicola's was fantastic. They have a lasagne that is chicken and artichoke...to die for fantastic!!