I think that the best sites to buy a domain name are the most known and the biggest.
1.
Thing you must look at that the site is 100% the site you are thinking about. Some scammers buy almost the same domain and try to cheat you. (for us is goddady.com)
2.
Use if is possible paypal or alertpay,... Or things that are known and work the same way. Exposing your credit card is not a very inteligent way of buying.
3.
Buy domains when are low-priced, some days godaddy makes the price of a domain so cheap that is funny. Now is a lot cheap the domain .info.
4.
Ask your hosting provider if he allowed you to put domain bought from other places on their host, normally they allow but there we can find some host that not.
That is almost all. Try to find a cool name and start your sites.
