i am very big on .com's.
I use Godaddy for metulburr.com. They always have deals or promo codes of some sort that you can find all over the web. The Linux Action Show gives off some really sweet deals for godaddy. Unless you are looking for a well known name, you can usually pick one up with a promo code for a $1.99 for the first year, every year thereafter is something like $15 a year. However throughout the year you can find deals for them as well. For example i just bought a few years for half off each year, only because i saw the deal was in september. So I ended up spending like 20 bucks for 3 years. Now this is all just the domain name only, as i have no idea about hosting, as i host my own website.
Once you purchase a domain name, you can point your domain name to your hosting IP address, etc. and walla, that domain name from thereafter is the alias to your ip address.