The last time I was in Vegas, the second tower of the Wynn, the Encore, just opened and we got a fantastic rate of $119. They have been offering some specials recently and I would highly recommend it if it's within your budget. After staying there, it is the ONLY hotel I really desire for a return visit.
Of your list, I have friends who stay at the Luxor and like it just fine. Like the MGM, the original attractions have long since gone and replaced with generic slots and tables. If you're going to be out and about on the strip a lot, I wouldn't go with the Hilton unless you plan on purchasing monorail passes. The monorail runs late, but is not 24-hours. the monorail has no stops close to Las Vegas Boulevard between the Sahara and Harrah's, but the Hilton is set back a bit from Las Vegas Boulevard.
I've only ever seen the casino for Monte Carlo and there really isn't much to see. But if the rooms are nice, then go for it. The location is optimal. Treasure Island and New York, New York both have reputations of being pretty loud. Especially with the roller coaster that winds around and through the New York, New York hotel.
One that pleasantly surprised me was the Planet Hollywood resort. Excellent location and the casino was more modern and low-key. I was afraid it would be too obnoxious for the MTV set, but I found myself spending quite a bit of time there.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian