Shopping for a new mattress. Recommendations/tips?

[Clarkmeister]

I do plan on researching this topic later on in the week, but I figured someone in OOT could have some really good tips. I'm looking for a King or Cal-King bed. Something very nice, maybe in the $1,200-$3,000 range. Any recommendations regarding manufacurer, or ordering over the internet vs. a local outlet? TIA.