I finally made the jump and bought my latex mattress.  It's from a samll company called Custom Comfort in Orange County, CA that builds their own mattresses.  It's not a "build your own" style, it's a 6" core of 32 ILD with 2" softer on the top and the bottom (10" total).  It does not come with a return guarantee, but it does come with a comfort guarantee - if the latex layers don't work out they will pick up the mattress and adjust the latex layers.  It's designed to be a flippable mattress for increased durability.

The latex is blended Talalay from LI (Talatech) and the covering is cotton/bamboo.  It does have a layer of the fire retardent material, so in that sense it is not one of the all natural/organic mattresses some prefer.  All natural/organic isn't as important to me as all Talalay, and I wanted the blended Talalay due to LI's opinion that it is more durable than all natural Talalay.

BTW, if anyone is thinking of getting a traditional mattress, you might want to look at this company.  They make all their mattresses the "old fashioned" way, with quality springs, and NO FOAM fillers (except on some traditional mattresses they offer a memory foam or latex topper layer).  Or, if you're thinking of going latex they have three standard models but basically will build whatever you want.  Their standard is the Talatech latex, but they will build with 100% botanical Talalay at no extra cost if that's what you prefer.

It's arriving tomorrow and my aching back is looking forward to it.