Adam,
I think that you need to take a step back first. You look like you are diving straight in, and want to discuss "solutions" on the forum. You should instead start by identifying your requirements. This includes considering your room as an overall system, and identifying if isolation is in fact the best route to go down.
By this I mean that if your room has a wooden floor, and you have neighbours living below, then you may well need to isolate your speakers - to avoid energy being transferred into the floor, and making that act like a huge speaker, and affecting your room resonances, and your neighbours ears.
If instead your room has a solid concrete floor, and no neighbours, then you may be better by reducing the isolation, and letting the energy be absorbed into, and then damped by the floor.
Just because some forum members advocate a solution as being excellent for their room, does not mean that the same solution is the best one for your room. So clarify your needs in your mind, before you start thinking about spending money on a "solution".