I'm in the market for a new twin-size mattress and have looked at a few threads already where they talk about the layers, support, the type of materials, etc. That said, I am basically like one of those clients that doesn't know what they want. I've been to some retailer's show floors and stuff at my nearby mall and I feel like I could fall asleep on damn near any of the mattresses I tried. What I've noticed in my research and looking through reviews/posts is that there seems to be hit or miss all over the place. Every single brand out there has people claiming that they've had that mattress for several years and it's good, and then on the other hand you have people saying that it sagged less than a year in or whatever.

I'm not exactly sure what the takeaway is other than you kinda have to get lucky with the QA.

Sleep posture: Side-sleeping is when I think I'm most comfortable falling asleep, but I'm sure that I wake up on my back sometimes too. Not really sure what to make of that. Also I think I run colder than average, so I don't necessarily need any cooling function.

Health conditions: As far as I know, I don't have any like back pain and the like. Ideally the mattress I buy will help to prevent any of that.

Budget: I would say a max of $1K. I'm not really trying to break the bank, but I'm also willing to splurge on something that is as important as a mattress and regularly getting a good night's sleep.