I had the same debate you did months ago and found a easier solution. Instead of dishing out the $2,500 for the tempurpedic, I bought the Isotonic Mattress topper for $400. It’s like a feather bed in the sence you lay it on top of your already existing mattress, but the quality of the foam is so superior to tempurpedic I cant describe it in words. I have standard Nautica queen sheets on my mattress wich ran me $1000 back in the day. Id say the Isotonic had made my bed better then when I first got it. I dont mean to sound like a Bed Bath & Beyond sales rep but that is my honest opinion.
Like an old friend of mine once said “Anything you buy that makes you happy is money well spent”. So if you can afford the luxury, indulge and god bless you.