The following is my opinion only;
Air Beds = leak.
Electric air pumps to keep bed inflated = fail, when you need sleep the most.
"Space-type Swedish NASA Foam" = 3 times the money, for the same bed.
When I last purchased, I spent a bunch of time researching. Even found a guy handmaking custom mattresses in Philly! I found that the pillow-tops are comfortable looking, but that pillow-top will crush in a relatively short time (I expect a mattress to last 15+ years). Furthermore, those silly 2-foot-thick mattresses are crazy hard to find linens for, and said linens will be far more costly than they should be.
I finally bought a top-line Stearns & Foster, standard construction, padded, but no pillow-top. I put it in a beautiful Victorian replica bed (5 years before they showed up in the damn stores), and I have never been more pleased with how I spent my money. It's amazingly comfortable, durable, and stays looking great with just a thrice-yearly turn.
I'd say...stick to the traditional construction, and a reputable name. Once you've narrowed it down, shop pricing, warranties and quality of service. Be careful, a lot of these dealers are trash, and not to be dealt with.
Put your money in traditional quality, and do business with a reliable, etsablished and reputable dealer...you'll still be glad of the purchase years from now.
Good Luck!