What you are trying to talk about is Exact Match Domains(EMD). There is a popular article here on SEOMoz about this http://www.seomoz.org/blog/the-exact-match-domain-playbook-a-guide-and-best-practices-for-emds
If you wanna create a brand for yourself then do not use EMD if it doesn't contain your brand name.
Apart from EMD there are many more ways to increase organic traffic, so EMD isn't a necessary these days(especially after Penguin, Panda and all the animal updates in the world Google knows about 
)
Create your brand(legacy), seo will take time but in the end it will be worth it 
