I was trying to grab the best keyword combinations of domains, but some how nowadays people seem to be much more interested in aged domains although those domains does not have any traffic and any meaning at all. So what are your domain buying/registering criterias? what is more important for you? domain extension? keyword combination? age of the domain?
domain extension? only .com keyword combination? prefer just one keyword age of the domain? don't even check it
we use a lot of criteria- one of them is whether there are advertisers listed and search volume per https://adwords.google.com/select/KeywordToolExternal
The exact keyword phrase is the most important. Specifically, you need to know how many searches are performed for that exact phrase monthly. Essociate provided you the link to the tool I recommend. The .com extension is the most important. If I remember correctly, most browsers default to the .com extension for people typing in the exact keyword phrase in the browser URL. However, verify this if true.
.com better the shorter the better and that's not it.. Spellable? without dashes? keyworded? Add those 3.
If you plan google traffic - better keyword rich domain. Aged domains with history have good PR authority. Extention only .com