Are you male or female?
However, Tag Heuer, Omega, Breitling, Raymond Wiel are the top watch makers and you may find one for about �500 although this would probably be one of their bottom of the range watches, but still top notch!!
If you are female and looking for a more designer watch then go for Dior, Gucci, or Armani, although these are more likely to date.
Tiffany also do nice watches, although I am not sure what sort of prices they run to.
Good jewellers to visit are Beaverbrooks, Ernest Jones and Goldsmiths