I'm trying to decide what to buy, and there's too much choice.  I've tried lying on various memory foam, latex, spring, etc, mattresses and they all feel "fine" to me.  We are in our late 20's, 120lbs and 160lbs, so we're relatively light.  I think we do prefer the softer/plushy beds, at least when lying on them for a minute, so "normal" leaning towards plush would be good.  My current thinking is to buy an 8" base bed and then a topper, so that the topper can be easily changed out should "indentations" form.  My current thinking would be:

• Walmart 8" for $249 (2" 3lb memory foam, 2" soft foam, 4" high density foam): http://www.walmart.com/ip/Spa-Sensations-8-Memory-Foam-Mattress/12542632
• Overstock 8" for $225 (2" memory foam, 3", 3"): http://www.overstock.com/Home-Garden/Sarah-Peyton-Convection-Cooled-8-inch-Queen-size-Memory-Foam-Mattress/4599636/product.html
• 2-3" topper (latex? memory foam? no idea what density is best for us) for $100-$200

For an all-in-one, my other picks would be:

• Overstock 11" for $359 (Soft: 2" 3.5lb memory foam, 2" 2.5lb memory foam, 5" 1.4lb PU, 2" 1.5lb PU): http://www.overstock.com/Home-Garden/Comfort-Dreams-Select-A-Firmness-11-inch-Queen-size-Memory-Foam-Mattress/3158654/product.html
• Amazon Lucid 12" for $399 (2" 4lb memory foam, 2" 3lb memory foam, 8" PU) http://www.amazon.com/LinenSpa-Triple-Layer-Viscoelastic-Mattress-Warranty/dp/B0050JL4LA
• Walmart 12" for $359 (1.5" 4lbs memory foam, 2.5" 3.5lbs memory foam, 8" PU): http://www.walmart.com/ip/Spa-Sensations-12-Memory-Foam/6538605

It looks like prices have dropped a bit since I last checked due to the holiday season.. so.. anyone have a recommendation between these choices (first, combo vs all-in-one, and then, which one in that category)?  Thanks!