Does anyone know of a reasonably priced Friday Brunch not too far from Burj Khalifa, so probably in Deira or Bur Dubai, I don't want to pay 5 star hotel prices, where I think alot of the brunches are !

The Burj Khalifa is distancewise, reasonably midway between the beach properties and Deira / Bur Bubai properties so you will not really travel too much etiher way. In Deira most of the brunches are in 5* properties.
For budget brunches : http://www.timeoutdubai.com/restaurants/features/2425-ten-to-try-bargain-brunches
Legends is pretty good value for money.
Top of the ranges ones included in this one just for comparison. http://www.timeoutdubai.com/restaurants/features/2361-30-brunch-ideas
