The venetian is ace. Also Wynn is great, but if its just the lads you cant go wrong with the palms hotel 8) Although the Wynn and Venetian are better located.
Go on their sites and register for newsletters, you get some incredible offers. My mate went in march, he booked his flight in advance, then waited for offers to come through. He got a suite at the venetian for $800 for 4 nights. $400 dollars each per room
The rooms in vegas are great value if you shop around, and are prepared to wait. They make their money on the gamblers !!