
Exped
MegaMat Series
Car camping comfort king; warm and durable.

Running these analyses costs money. Buy through my links to help keep lights on! I may get a small commission.
Thermarest neoairs are too loud and crinkly for me. Rab style of mattress doesn't do well for me as a side to belly sleeper. Nemo is my pick because the only air pads I've kept are Nemo. An astro non-insulated pad is my summer pad with an older cosmo insulated pad being my 30 to 55-deg pad.
R value of 2.6 is not bad, it's still an "insulated" pad though, I'm hoping to get something with this level of quality, packability, and comfort without the added insulation. Nemo is a great brand though, I have a few items and I love them (I wish they would get back to me about my warranty though 🙄)
I cut a Nemo astrolite pad in half and gave my girl her own WM megalite quilt to sleep on. She’s ten years old, and I just can’t make her sleep on a thin foam pad in her golden years.
Dump the nemo Astro out of the running: Its R value is listed at only 2.6 and it's 1lb 11 oz. The others are warmer and lighter. Plus it's a 20" wide pad. I don't know why, after all these years, we don't have a 23" option - more comfy than a 20", which tbh sucks but lighter than a 25". But I digress. We don't. It's either 20" or. 25". 25" is a way nicer nights sleep and Some of the pricier pads you've chosen here come in at this size for a very similar weight and significantly more warmth. And since all of these options are in your price range, according to you, then I'd say dump the nemo Astro. By comparison, the other Nemo pad, the extreme conditions, is an 8.5 r value and the Long and Wide size Is only 1 lb 10 oz. That's WAY warmer and more comfortable. It may suffer from a little less durability. Rab is a REALLY solid brand. I would categorically buy anything they made, and I have a lot of Rab gear. So if you are ok with a 20" pad, then this might really hit a sweet spot for you if price is an issue. I would forever and always buy a 5.5 R rating pad over a 2.6. The Thermarest has a very, very good 7+ R rating while also being very light for a long wide mat at 1lb 8 oz. Kinda seems like the winner to me. Again, the question is durability and how you will use it. If you expect to be at altitude or in cold weather or shoulder season, you'll want at least a 5 R value. Fyi Exped pads are really super too. I rock an older down filled Exped mat that's been good to me for a very long time now. R rating of 7+ - Have taken that into 20 degree temps on Mt Rainier for winter camping etc.
I've been using the Nemo you're looking at (the wide version) for a few months now, including nights that got below 0°C and cannot fault it. Using with a -8 quilt as I'm a front and side sleeper and I can honestly say I've never slept better in the field.
No worries. I forgot to mention the Nemo is fairly quiet, too - not as crinkly if you toss and turn a bit (I'm a restless sleeper, so it makes a difference for me)
Exped and Nemo both have thick pads and they aren’t crinkly like Thermarest. :)

Exped
MegaMat Series
Car camping comfort king; warm and durable.

NEMO
Tensor Series
Lightweight side sleeper favorite, but polarizing on warmth and noise.

Exped
Ultra Series
Comfortable, quiet side sleeper pad; compact for backpacking.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with unique side rails; R-value and durability disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable; a bit heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series