November is a good time becuase its a bit quieter and the prices usually drop a bit. Towards the end of November you'll find some of the best deals of the year.
We keep a
Las Vegas Hotel Deals post that you can find some great deals on strip hotels. Weekends are typically twice is as expsensive since there are so many weekenders going to Vegas. If your looking for the cheapest days consider arriving on a sunday and staying the six nights.
For $200-$250 you can get a room at a 3 or 4 star hotel. Check out the deals link above and write back if you have more questions.