Please suggest the best bed/mattress.

Maximum size bed is Kingsize due to existing fitted furniture. My husband is 15 & half stone and I weigh 14 stone. We sleep back to back. In the past I have preferred sprung bases as I find platform bases to hard at the edge. We both prefer a medium feel. My husband suffers from an occasional bad back and I have generalised joint & muscle pain from neck to knee. 2 drawers would be preferable. Budget is not the biggest concern but aim to spend a maximum of £2k altogether including headboard.