hi you have recommended origin 1500 mattress zip link one side medium one side firmi was getting a bedstead but reading your website has made me think again as 1 i don't think it will fit width wise and 2 i would need to board the baseso I'm now looking at a divan base - what base though - do you think sprung is best with this mattress ? also would the zip link sit right on the base as the join is up the middle on the sprung bases - I'm not sure what to go for?many thanks marie