Since this is a Marriott site, I'm assuming you want info on Marriott's in Las Vegas.
We spend approximately 50 nights a year in the Marriott Suites on Convention Center Drive. It's one block off the strip and close to everything. The staff is our extended family. Approximate cost $129.00 per nite. Ask for a room with French doors dividing the bedroom from the living area. There is a Residence Inn and a Courtyard next door (approx same price for the Residence Inn). We've stayed there, but like the Marriott Suites the best. Further south (approx 1/2 mile)is another Residence Inn (Hughes), but we've never stayed there. It's also one block off the strip.
The latest property to become a Marriott was purchased by Canadians in Jan. 2002(JW Marriott). It's way out west (about 8 miles) and away from everything, but it's really nice. Unless you're home sick for more Canadians I'd stay at the Marriott Suites, on Convention Center Drive.
If you don't care if it's a Marriott, there are plenty of other hotels to choose from.