A quid is a slang term for the British pound. So currently, 1000 quid (or 1000 pounds) is about $1500 US dollars.
Sidebar is a theme feature introduced with Version 2.2. It's basically a vertical column provided by a theme for displaying information other than the main content of the web page. Themes usually provide at least one sidebar at the left or right of the content.
Sideboard: The distinguishing feature of sideboards, according to Houzz, are the short legs. The cabinets may also reach all the way to the floor. Buffet: There is no defining difference between a buffet and sideboard, but if the piece has relatively high legs, it may be referred to as a buffet instead of a sideboard. Server: A server is smaller, shorter, and more formal than a buffet or sideboard.