If they can both get enough time, I'd keep both. Well, that is based on the HD650 and HD600. For me, the HD600 at work where I want to be productive and listen to classical, the HD650 at home for where I want to chill. But for me both have not been worth it in the same location. I'd rather mix it up with a TH-X00, for example...
As both are readily available, it might be best to base your decision on opportunity cost: would you rather have the ~$200 to save or to spend on something else? "Jesus saves. Moses invests."
Not a huge fan of stock 650, but am enjoying modded version. Each of it and 600 has their own virtues. Probably still prefer 600 but can see a place for each.
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