We have tested the Megaman 6W dimmable with the 1A dimmer and they are perfect, we set up 8 on a rig with the full dim range 0-100 and no flicker. We are going to try 12 next when we get a chance.
They cost about £10 each.
We have also been looking into importing direct from the manufacturer the same LED's that are available on eBay by an Australian supplier but they would ship here at around the same price and its hard to gauge the interest, we have tested them and they are very bright!!!!