My BIL has a bad back, he and his wife love the Sleep bed. A pillow top sounds too engulfing to me. I am not heavy but can't move much. We have 2 inch deep memory foam (do not find it hot) and I have satin fitted sheets with allows me some movement. They come in colors for use in "fun" bedrooms. This amuse me, one on now is a jewel blue, and I kind of like it!

Buy the whole sleep bed, don't try to reuse old stuff that could possible cause damage.

Clothes are best bought one or so at a time, when you see the right thing. All at once sounds like a recipe for disaster.