Nothing is going to have a r value 8 and not be slightly bulky....the closest to warmth you are going to get is the thermarest neoairxtherm at 6.9.
I've slept on frozen ground with a yoga matt no trouble.
My go to is an thermarest neoair xlite but it's not a luxurious matt, it's narrow and reasonably loud to sleep on, some people would have a terrible sleep with one.
So many variables but r value is the best indicator of warmth and if you want something on par with your last one it's going to cost you a shit load or its going to be very bulky
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