History-
I worked Undercover in a Mattress Warehouse for The Bon Marche up here in Washington. My "job" was to throw around mattresses in the warehouse and get them ready for delivery/will call, etc. I learned a GREAT DEAL about them working there.
My take-
If you want to but a WELL MANUFACTURED and WELL RESEARCHED mattress, go with a Serta.
I wouldn't bother with Sealy right now, the past year they have been having a recall for manufacturing defects in the springs.
If you want a LIGHT mattress that is EXTREMELY soft go with Spring Air, they are mostly foam inside.
I have a Serta in my house (and I was able to choose whatever I like, due to my position), and won't ever go abck to anything else.
But the choice is yours. My suggestion is to go the the mattress store, take off your shoes, and start jumping on every mattress you see there. (I'm not kidding, it's a very common thing to do at a mattress store.) That way, you can see which one feels best to your feet/how much weight it'll hold/how firm it is/various other things.
But make sure that you get a Money-Back guarantee, that if you don't like it for any reason, you can take it back. I wouldn't throw down 2k and not be able to bring the product back.
-UHLEK-