I would highly recommend Binions, downtown Vegas.
They have 4 tourneys a day, and on Friday/Saturday, they add 10k to sweeten the pot.
Link here:
http://www.binions.com/gaming/tournaments.html
You might also check out the Venetian as well, as they have a $170 event ($130 + one $50 rebuy if you so choose), that gets good attendence, at least when I was there.
That one plays at 8pm each night.
They also have one earlier in the day, but the cost is much higher (I forget how much).
Link to the Venetian:
http://www.venetian.com/POKERROOM.aspx