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Default vs Impl when implementing interfaces in Java

After reading http://programmers.stackexchange.com/q/75919/7167 it occurred to me that I've never seen a proper debate covering one of my pet peeves: naming implementations of interfaces.

Let's assume that you have a interface Order that is intended to be implemented in a variety of ways but there is only the initial implementation when the project is first created. Do you go for DefaultOrder or OrderImpl or some other variant to avoid the false dichotomy?

And most important... why?