In South Africa I'm strugglingto get any worthwhile 5xxx series except the 5870. Costs ~$500 and deliveres about 350-400 Mhash's .
I settled for two 6870 which deliveres about 260 Mhash's $326. I then got two 6950's /300-350 Mhash's $407.
In 6xxx you seem to rather get what u pay for. . I'm at ~1200 Mhash's  with 2 x 6870's and 2 x 6950's on 3 machines.

Is that code for "Smuggler"? 

This is inconvenient. Really had something to add....