Remember, Herbs, that under the new EU GDPR regulations, you are entitled to to be told by your memory mattress exactly what it knows about you, and you have the right to demand that it forgets you.
We all gooners at the end of the day. That's all that mattress.
Memory foam for me is pants, just feels wrong. Last good bed I bought was 1200. Worth every penny. Pocket sprung with memory foam topping. It's a 'no turn' thing and feels so right. Spend as much as you can afford and then you won't even be disturbed if your partner turns in the night. Also get a firm one, as they give you a better base for acrobatic sex.