A firm mattress, like the Staples Eleanor?

You guys and your informative website are enlightening!

So glad I came across it, almost read the whole site learning about the industry. I'd like your personal recommendation please. We are both 70-75kg but being Japanese prefer firmer mattresses (used to sleeping on futons etc). Tried out so many kings in the shops, each shop has at least 1 we like and many more we don't. One that seems to like us is the Staples Eleanor which can be chosen as a firm option & has side stiching - we really put emphasis on the edge quality as much as the overall mattress. Ignoring the inflated shop prices it's online price is around £475 and our ideal budget is £400 but I want to spend my money with you. Your Origins 1000 Reflex, with it's firmer support than the comfort, sounds like it might be a good comparison and would love to hear your take. But we've also been hoodwinked into 1200, 1400 up to 2000 springs. They certainly feel firmer to us the more springs there are, but would your Origins 1500 feel softer to us against your 1000 Reflex?

Thanks for your time, Darsuke. .