Apollo available from superfi are good. You can always contact the manufacturer and save some money by buying direct but would have to fetch it from Birmingham. From personal experience i wouldn't touch an optimum rack. I have soundstyle Z2's and they fulfill the stands role for around £80 but partington for better speakers are also recommended.
In my theory, standing on balanced three spikes is more stable than four. I am using speaker stands with four spikes, but i doubt on how balance they can be adjusted. Take a look at a camera's tripod, it is a perfect stand.