Please go somewhere better than TGIF while in Vegas, please.
If you're going to splurge on some meals, I recommend(from experience):
Maestro Ocean Club - it's a steak/seafood place inside the Shops at Crystals in between Cosmo and Aria. 40+/plate ish
Wicked Spoon - buffet inside Cosmo $30-50
The buffet inside The Wynn - can't think of name $20-50
Steakhouse inside Bellagio - can't think of name either $40+/plate
Grand Lux Cafe - at Venetian/Pallazzo - it's a chain restaurant with a huge menu. Good good. $10+
Sweets Factory - candy store/ice cream shop/bar - I think it's across from Caesar's, but I can't remember at all. Not sure of prices here, but everything here is more than you'd expect to pay for the kind of food/drinks you get.
Everything on the strip is costly.
Oh! Forgot about Peppermill, it's down the strip some away from Cosmo going towards Stratosphere. JM3 took us there.