I'm afraid not. It would appear from the error you received when trying to register the domain that someone has already registered it.
You can actually add any domain you want to the DreamHost system as fully hosted or parked etc, unless it has already been added by someone else. It just won't achieve a lot unless you have also registered the domain and configured it to use the DreamHost name servers (this is done automatically if you register the domain at DreamHost).
I can only suggest that you remove titanstudios.com from the hosting system and either pick a new domain name, or contact the current owner of titanstudios.com and try to purchase the domain, but this is likely to cost you more than $9.95. The link below will show you the contact information for the current owner of titanstudios.com
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