One hot Internet topic, these days, involves specialised ("vanity") domains. The hot names seem to change, by the week. This week, enom is hyping ".family", ".live", ".rocks", and ".social" . Other registrars may have other recommendations. The blog Address (Name) is a key blog identity element , in a well designed blog. It's visible both to people, and to search engine crawlers. The requirement that addresses must be unique is a supposed benefit of vanity top level domains - but vanity TLDs, alone, will not provide blog uniqueness. There will always be competition for some names, in any useful Top Level Domain.
What Blogger won't tell you