Hi! We just purchased a foam topped mattress from King Koil and we LOVE IT.
I had a pillow-top before that La_Man did not care for due to being too soft and he had a Chinese bed (which basically is a cement block covered in fabric - IT WAS HARD lol sorry baby I just could not resist

). So we got this one and we both love it!!! We sleep like babies nightly and we feel no added heat or coolneess.
And yeah, our mattress requires deep pocketed sheets.
Good luck!!!