Looking at getting a new mattress.  I have read this entire thread.  Surprised some of you guys can spend 3-4 grand on a bed.  Insane!
Any updates.....  Looking at that Casper bed as it has received a lot of good reviews.  Seems to be the hot new item on the market.
		
		
	 
 I haven't read this thread but I just bought a mattress 3 months ago.  I spent a ton of time on this site...
http://www.themattressunderground.com/
Great tutorials on buying and then TONS of info in the threads about specific mattresses, manufacturers, and mattress types.
I ended up buying a DreamFoam mattress (also sold as Brooklyn Brothers) off of Amazon.  I went and tested the Tempur-Pedics in the store a few different times and picked the one I liked most, the Cloud Supreme.  Then I bought the equivalent DreamFoam version for $800 instead of the $2k+ Tempur-Pedic.   I've been sleeping on it for 3 months, the first month right on the floor, the last two on a regular bed/boxspring.  It's the most comfortable thing I've ever slept on. I had nightly shoulder and hip pain for years when sleeping and it's completely gone, although i've also lost 40lbs so that is part of it too.  But I started weight loss after buying the bed and the pain went away immediately, as soon as I started sleeping on it.  Sleep has been dramatically better for both myself and my wife (who has a much harder time sleeping than me).
Couple things I learned:
*  Learn how to find the right mattress fit, that was the best thing I learned initially on that web site.  Figuring out what makes a mattress comfortable and how to find the right "fit" made a big difference.  I was no longer picking what had the most "specs" for the less price and actually finding a mattress that fit my and my wifes body and sleeping habits.
*  Definitely test mattress types.  I was convinced after reading that I wanted a Latex mattress.  Then I actually laid down on one and realized I hated it.  Some people can't handle heat in gels, some people hate sinking feeling of memory foam, etc.  Even if you are buying online, definitely go to a store and lie on mattress types and pay attention to the material types, density, and thicknesses in each layer.
*  Apparently materials really matter. There are some cheaper mattresses out there but from what I've read they can start falling apart and sagging because of build quality and bad materials.  The DreamFoam materials are supposedly great and they're U.S. made so they don't sit on a container ship for months and months, rolled up in a vacuum packed box which can cause breakdown in foams (serious/long term) and increase the foul smell when you open the mattress up (short term/fades).
*  Avoid the big S manufacturers:  Sealy, Simmons, Stearns, and Serta.   Overpriced to pay for all those salespeople and mattress stores.  Any nice big "S" mattress you find you'll be able
to find something comparable, cheaper, and probably made better if you do some research on the mattress undergound.
I don't know if my mattress will stand the test of time, we'll have to see in a few years.  They have great reviews on amazon (but I barely trust those anymore) and more importantly they get great reviews on mattress underground form people who take this way more serious than I do.
What's really funny is in the last couple months I've had a couple occasions where someone has brought up buying a mattress or asked about our new mattress.  I sound like a complete LUNATIC talking about mattresses now. I sound like one of those wacko audiophiles discussing a set of headphones except I'm talking about mattresses.  I usually interrupt and say, I'm not really crazy, I just happened to find this website... eyes roll... blah, blah, blah
I can't recommend Dream Foam enough.
Good Luck!