When I replace my bedding (around every 6 to 10 years) the complete stuff costs between £500/600.
Yes totally agree, a good nights sleep is invaluable, you spend a 3rd of every single day in your bed, so buy the best you can - plus, as said, I get up to 10 years out of it, so the cost per year is reasonable.
For example my pillows were £20 each, however, they were worth every single penny.
They are down feel, but are made of microfiber cluster which is brilliant; as I will now not touch Down bedding after I saw the horrific (and I mean horrific) way it's sourced (and I used to love Down bedding) However, it's a personal choice.
I got these pillows and they're ace - I got the superking size, put these into a Oxford size pillow case and they are huge and bouncy.
I also got the duvet to match, which again are amazing, they really do feel like down, but I can sleep without hearing screaming geese/ducks - sorry.
*However, I contacted Marks and Spencer and they advised me their Down is not sourced from live birds.
The site the pillows are on, King of Cotton is a great site, used it a couple of times.
Here is the duvet I got; got the 2 in one version and a separate standard one - they are both brill.