Thanks for the suggestions Lynn, I have to say that I love the look of 'cape blanco'
Yes Bev, you're right, I think i need to get most of my semps in place first and then see what will work best in terms of colour and texture.
I'm hoping to be able to do that this weekend (fingers crossed for good weather) and then I can start narrowing down my chocies.
One this that does concern me is that the whole bed will end up over run with sedum, I don't want something that I'm going to have to keep weeding out all the time.