Some of them come with storage options for your books and lamps within the headboard, while some allow pillows and linens to be placed on them. This site has a divan beds sale now on, and there you can find plenty of beds with great storage options.
You should also be mindful that many bulker beds would probably have to be dismantled to fit through the Once in place, you will have to re-assemble it. They have a good choice of mattresses for bulkier beds at Mattress Time.
Many people If you require additional firmness then you should opt for a latex mattress topper. Latex mattress toppers are available in soft, hard or medium firmness. I recently got a great topper for less than £20 at this cheap mattress sale.