Car Write off - Should I take insurance money and buy another car or try to get it repaired?

Hi Today my car was written off after it was assessed after an accident last saturday. At present I haven't been given the type of catagory it is under. Is it best as the garage have deemed it a total loss to leave well alone, take the insurance money and buy another car? Or see if they can fix it but know I will never be able to sell it? The car in question is an 06 plate vw polo 1.4 tdi with 34000 miles on the clock. The damage is mainly to front of engine, drivers side wing, bonnet, bumper and radiator. I would much appreciate some advice. Rgds Katherine