If you want to plan more than 21 days ahead, then check out
http://hotelclub.net
Most of rates will include breakfast for 4* and up.
You can select the area you want.
If less than 21 days ahead, then they have a last minute section:
http://lm.hotelclub.net
Less choice of hotels, but you can get 4 and 5* hotels around your budget.
Good luck.