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Old expiring domains are much better in compare to new registered. At first have some traffic, backlinks and some of them also authority site. Usually are indexed in major search engines, Yahoo directory and Google directory.
Expired domains are also much better for search engine optimization, make this process much easier, because have trust and age history. Who thinking seriusly about make a SEO, buying expired domain name with traffic and inbound links.
Domains with traffic always have keywords list, by this keywords usually comming organic traffic from search engines. Sometimes it can be really expensive keywords which we can use in google adwords and grow at it.