Did exactly what you said.
Opened an account with dyndns.org (DUC was already on my router).
Bought the domain names (.com and .org) from godaddy. Then created CNAMES pointing to dyndns name. Everything was working in less than an hour.
The hardest part was trying to find where the CNAMES can be created. Here are the steps for anyone interested:
=================================================
1. Buy your domain name and create account with godaddy.
2. Login and select (my account).
3. Select (manage domains).
4. Then select the 'link' not checkbox of your domain name.
5. To the right you will have a box called "Domain Details". Select (Total DNS Control).
6. Select (Total DNS Control and MX Records).
7. If it does not open automatically select (Launch Total DNS Control Manager) and you are there.
==================================================
Thanks a lot.