The poker rate at the Wynn is a little cheaper than Bellagio or Venetian ($129 weekdays, $199 weekends vs. $149/$219 for Bellagio and $169/$259 for Venetian). I believe you need 6 hrs. play/day for poker rate at Wynn and Bellagio and 8hrs/day at the Venetian. The Venetians rooms are all "suites", and a little larger than the Wynn and Bellagio. I have stayed at Wynn and Bellagio, and preferred the standard rooms at the Wynn. Bellagio is the most centrally located of the 3.
The NL at the Wynn is 1/3 2/5 and 5/10 uncapped buyin. Venetian has 1/2 300 cap, 2/5 1000 cap, and 5/10 uncapped. Bellagio has 2/5 500 cap, 5/10 1000 cap, as well as larger uncapped games.
If you want to play higer stakes the Bellagio is the best choice. Check out
All Vegas Poker for a complete list of games they regularly spread. Good luck.