Jeffreyace,
I can't tell you which specific one to order as I am not up on which maker is doing the best mephisto clone. There are a few well known clone makers and a slew of no-names. You'll generally see tobeco, hcigar, infinite, acerig, and probably something I'm forgetting. Unfortunately, you can't fully trust that each if it's a tobeco it'll be good or bad, that kind of changes depending on the model. So the acerig cookobug might be great, but tobeco makes the best rallyvapor. This can also change by the revision they are cloning, with the first being rushed out the door and then improving.
So in general, you could google "tobeco vs infinite mephisto" or "tobeco mephisto" and find threads of people discussing their thoughts on a specific clone. Once you know what you're after, you can then contact the vendor asking which it is -- if they don't know, assume it's a no-name that's easily found on ebay.
HIH