Myers Deluxe Natural, Origins 1500 and Artisan Natural (Kingsize)

I have looked at your mattresses for a long time but always questioned myself about paying £1100 for the Artisan Naturals, so started to look at your man made Origins 1500. Here is my dilemma, I have just seen a Myers Deluxe Natural £519 at my next mattress. So here is my Maths
Artisan Naturals £1140 mostly natural fillings 10yr guarantee, Myers Deluxe Natural, natural fillings 8yr guarantee, half a bed but compensated by 50% plus price reduction £519.
Origins 1500 man made 3yr guarantee, Myers Deluxe Natural, natural fillings 8yr guarantee according to Myers website both in the same price range
So if I have done my maths right I would be grateful if you can give any further advice here please. All mattresses would be going on a pocket sprung base.
We are both 11-12 stone 5ft 4 and 5ft 8 and would prefer a medium if not softer feel in the top layers. We are coming from a awful memory foam after 2yrs back to pocket sprung.
Grateful for your opinion