Which mattress for us now

Hi. We currently have an ancient slumberland orthoposture 1100 series mattress. It is definitely time for a new one! My husband is quite taken with the simba/ eve hype but I'm not so convinced! I have slept on a Tempur mattress which I found comfy but a bit soft and my husband got v hot! I like something that offers a good medium to slightly firm support (hence my inclination to stick with pocket sprung), my husband errs more on the side of just medium support but we'd still like a mattress that has that slight sinking feel when you first get in! We have 3 kids who often find their way into our bed so we move move around a lot during the night!Budget wise, we're aiming for around £700, happy to look at mattress and topper combos if necessary... Am I asking the impossible or is there a mattress out there for us?I have done so much looking and am beginning to get a bit bamboozled!Thanks so much for your time