Looks like an Aurora WF-800. You can get one from DealExtreme.com.
Do a search for WF-600 here on CPF and you'll find several reviews, some include comparisons to the DBS & a Fenix Q5 light. The Aurora throws right up there with them, or out throws them.
I have the WF-600, its an amazing little light. It is an AWESOME thrower. Really, you'll be impressed.
The only difference between the 600 & 800 is the 800 runs on twice the batteries. You can also run two 18650's in the 800. Note: There are 2 version so of the WF-600, one is multivoltage, the other runs on 18650's ONLY. Your ebay light looks to be the multivoltage version of the WF-800, as it will run on CR123A's also.
DealExtreme is slightly more expensive than the ebay light, but they also have free shipping. Expect at least 2 weeks for arrival time on the light though. KD also carries this light.