I just fitted some 120w total, £35 ones off ebay, I think someone bought the same direct from China £25.
They look good enough, nice and white, but it does emphasise the fact that the inners are where the bulbs are and the outer eyes less bright. They fitted no problem. Fitted both in about minute and half.
I tried some others for £70 some 3 years ago, they were rubbish so sent them back.
In fact this is what I now have;
http://www.ebay.co.uk/itm/BMW-Angel-Eyes-H8-120W-CREE-LED-Marker-Halo-Light-E82-E90-E92-E60-E61-E63-E89-X6/381843606211?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
The pictures they show of the white Z4 is exactly what you will see on the car, so they haven't been doctored.
The ballast are smaller than in the pictures, looks like a resistor in a small heatsink.