We bought this set
Sealy Posturepedic Natural Origins Dandelion and we love it! It is listed as firm but I'd say it's plush. It contours every curve so I no longer wake up with my arm sleeping and a sore shoulder if I sleep on my side. We also got a king size mattress and because our sitars to the second level are a switch back (kwim) a mattress with coils would not have fit. We are both large and we have had the mattress for two months and there are no indents but we can't rate it long term.
When comparing prices always 1/2 the sticker price of any mattress set as they go on sale like every second week. Our set from costco I knew there was a sale coming up so I waited but I would have paid the non sale price too. And you can't beat their return policy. Maybe it was because our old mattress was so terrible that we love this one so much but I recommend it.