In search of a private venue...

I am looking for a venue to host a dinner for approximately 60 people of all ages and tastes. Ideally it would be on the strip or nearby as most guests will be from out of town. Cost is not a concern. In searching this board I've seen several recommendations for Magianos but I'd rather have something a bit more upscale or interesting than that. I'd like a private room. It need not be fancy, such that a great barbecue fest could be fun, but a "nice" restaurant would work, as well, so long as the food is good and approachable and the location suitable for a group. It would be on a Friday night about a year from now. Any suggestions you may have will be greatly appreciated.