Hi Fiona.

It is your weight that I would seriously bear in mind regarding your purchase.

In the majority of cases support and comfort should go hand in hand.

For you, support becomes secondary, and it is the comfort level (upholstery) that becomes the important factor - particularly when you take your fibromyalgia into consideration.

As a first option, I would say that our Origins Comfort (I know it's the cheapest) would be ideal for your weight.

However, with fibromyalgia I 'think' the deep tufting (and obvious uneven surface) on this mattress may cause you to experience some undue pressure.

To combat this, and to obviously give the cloud like feel you need, I would invest the money you save on a very soft (decent) topper - Down and feather for example.

Alternatively, out of all the mattresses you mention above, the Dunlopillo Cocoon would be worthy of a second look and trial.

Normally, I would say that our Origins Pocket Latex is a far better buy, but in your case you do not need the depth of latex we have in our model - a lesser built mattress (despite it costing you more) may be more suitable for your requirements.

Kind Regards Gary