This is a link to the Axxis tech data. If you click a catagory, it will show you how their ceramic pads stack up against others types. The Delux Advanced are the ceramic pads.
AXXIS BRAKES - Technical Charts
No personal experience with EBC rotors.
Also, just to be sure you know there is a difference between OE (which is the stuff you get from the BMW dealer) and OEM (which is a product made by a manufacturer who also makes OE equipment). OEM is not necessarily the same as OE.
A few good sites to start would be Dave Z., Turner and Bav Auto for OEM rotors.
BMW X5 Products - StopTech big brake kits, pads, tires
Turner Motorsport | BMW Front Brake Rotors - Discs
BMW Parts and BMW Accessories | Bavarian Autosport
Lastly, I would strongly suggest looking at the Centric rotors if you are considering going aftermarket. I have these rotors on my e53 and e36 and have been very happy. Quality appears to be pretty good, imo, and the coating on the hub keeps them looking nice for a long time.
DRUMS AND ROTORS - Centric Parts