
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.
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I have dozens of nights on a an older Tensor Insulated (The \~500g one) and I hope I'm not cursing myself here but it's been flawless. I've even used it for several nights in the shelters on Isle Royale with nothing underneath it. Now that I have switched to the Tensor Elite, I plan to unpack my Tyvek ground cloth if I stay in a shelter this fall.
Yeah I have an older Tensor insulated that is 3 inches thick, 4.2 r value, and 20oz, and it also cost around $190 at the time. This Eclipse is just better in every way and doesn't cost more, assuming durability is the same. When my Tensor wears out maybe I'll snag this.
I have an insulated Tensor (previous model) that I love. Also have a couple others that are fine. Setting up in a good spot (the slight slant on my last trip was brutal on my back) helps, and though I'm small, I find the cost/weight of the wide version to be worthwhile.
Besides the pad (I have a Nemo), consider putting whatever extra cloth-like material you've got into a stuff sack (I often use the one for the tent, but sometimes just roll things in a fleece) and put it between the knees.
I don’t think anyone else has mentioned this, but if you’re an REI member there are periodic 20% off coupons for full-price items. If you don’t need this right away that might be something to consider. Thermarest also just updated the XTherm and the previous version has been available at a steep discount. I got one for 40% off earlier this month at REI. I think they’re now sold out of them but there’s a chance you could find a deal at another retailer. Have not had a chance to try mine in the field yet but looking forward to it. I have one of the three-season, older versions of the Nemo Tensor and that’s a great pad, too. I also like the Exped Ultra line for backpacking pads.
I have used the Tensor Insulated RW (predecessor of the All Season) and (older generation) X-Lite mummy extensively, and I sleep equally well on both. Therefore, I prefer the X-Lite for it’s lower weight.
I have the NEMO (previous generation) in wide, got on a closeout sale around $90-100 from REI. Works great for me as a 230# side sleeper.

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but 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