purchase of a new bed and frame

Hi , I'm after a new bed and mattress, I would like to keep to around a budget of £2k, I'm looking for a super king size having realised that they are longer than normal double beds, I'm 6'1" 17 St. and my wife is 5'1 and appx. 11 St. we have used a sleepmaster memory foam mattress for the last 8 years on a wooden non-sprung slat bed frame, in the stores the only thing we can find most similar is the tempur 21 cloud ( similar due to the fact ours no longer has the lovely sink into it feeling that it used to have) - whats your advice? many thanks mark
many thanks