The hotels direct will come down, and usually end up a better deal, but sometimes the third party offers are too fantastic, its worth checking prices against direct not just when youre going but for this month and next.
For nov when I'm going the weekend is pretty expensive as theres a fight on but mgm direct has come down $60 a night in the last couple of weeks.
As you're going to be there after the new hotels open, depending on how they do there could be some future savings to be had with the increased number of top end rooms available.