I would suggest to really have a think about what you’re trying to achieve with the room first. What is the goal? What are the needs of the children going in there? What are their abilities? What already helps them?
This should help you to prioritise items in terms of sensory qualities of the items. I find sometimes a lot of money is spent on fancy equipment, but then the children don’t use it correctly, or it increases their arousal so it’s not necessarily fit for purpose.