I would make a rezzie at LOS. They expanded about five years ago, but they always are busy. We generally go for lunch and have no problem making a rez about a week prior. Our favorite menu items are the Nam Kao Tod (#14), the Crispy Mussel Omelet (#69), the catfish dish under #63, the Crispy Duck with Panang Curry (under Chef's Specials), the Drunken Noodles Sea Bass (also under Chef's Specials), and the coconut ice cream with sticky rice (and mango if in season). The somm should be able to steer you to an appropriate and well-priced Riesling. Be prepared, it is in a somewhat sketchy shopping plaza, but we have never had a problem.
Raku can be reasonable or pricy, depending what you order. We usually get some skewers to start (bacon wrapped enoki mushrooms and the kurobota pork are faves) and then move on to the house-made tofu (fried in dashi), the foie gras custard, and the crabs (if in season - you eat them whole in the shell). We usually go to Raku on a night when we have been to an earlier show. It opens around 6 pm. but really gets hopping (and cheffy, if that is your thing) after about 10 or 11 pm, when the Strip places start to wind down. Rezzies are a must.
No rezzies needed at Hot 'n' Juicy Crawfish -- you can look at their website to see if it is for you:
http://hotnjuicycrawfish.com/ We love it for casual lunch. Other good lunch spots for us have been Spago in Caesar's, Mesa Grill at Caesar's, Olives at the Bellagio, and Bouchon at the Venetian. If Estiatorio Milos in the Cosmopolitan is doing its lunch special (I think it was $30 or $35 for 3 courses), then run, do not walk, for some of the most pristine fish I have ever seen. Our current favorite Sunday brunch spot is MOzen at the Mandarin Oriental. It is super-spendy, but worth it, especially if you are prepared to drink your weight in the complementary champage.
For steak, my choice would be Wolfgang Puck's Cut (in the Venetian/Palazzo). The bone marrow flan is unbelievable. Expect to spend beaucoup bucks. We have never had a problem walking in and sitting at the bar.
If you wanted to combine steak and Italian, you could do apps and bread basket at Cut and then wander over to B&B Ristorante in the Venetian. The beggar's purses and the mint love letters are fantastic if they are on the menu. We also usually sit at the bar here -- it gets packed during the regular dinner hour.
At that point, I would go on down to Guy Savoy in Caesar's for dessert -- they do the classic three-star dessert cart and it is worth every dollar! We have never had a problem walking in here.
PM me if you plan to go to the north outlet mall -- I can put you in touch with my David Yurman sales rep if you are into their stuff. Outlet prices are 30% off the silver items, 40% off the gold, and more off of the clearance.