Bed and mattress, I think 8k-ish after discount. It's not cheap but the quality of materials is amazing, and it's by far the most comfortable bed I've ever slept in ever anywhere.
I've had back pains after sleeping on another bed for a night or two (travelling and such) and after sleeping for a night in my own I feel so much better. One of the best purchases ever all things considered.
I'm afraid I can't help with recommendations as I sleep on a 20 year old Ikea mattress that cost about 1k at the time. Its more comfortable than most 5 star hotel mattresses I have tried and I have no intention of changing it anytime soon.
I am now also freshly back from holidays and realize that I slept better in the hotels as in my own bed. The hotels had continental beds, whereas we a have non-continental at home(no springs in any form, although the mattress is a high quality one). That initiated a hunt for a good change of course.
In my experience luxurious hotel beds are often a somewhat ordinary bed with a lot of padding on top. Stayed at a top Swiss hotel recently in Davos and you could feel the springs. Was great for trampolining.
For me I'm very happy with an ikea foam bed with a memory-foam topper on it. I'm fairly lightweight so don't need much support.
We bought a box spring bed from Conforama, sort of like this but I think our model doesn't exist any more. We keep our old mattress on top of it and it's very comfortable. We like the box springs far better than the old lattenrost, and the storage feature is nice. We still have the foam topper that came with it but don't use it.