Hi, We are considering moving a Wordpress blog to Dreamhost. I would like to know if I can wait to use our existing Domain name after we have used the 2 week trial and make sure everything is to our liking?
That's really up to you. You don't have to change your domain name registrar to DH. You can use a dreamhosters.com sub-domain for free. You can add your domain to be hosted and then create a dreamhosters sub domain and make it a mirror of your domain name. You don't have to actually alter the nameservers of your domain name until you are ready. That way you will be able to work on your site through the sub-domain and if you do decide to stick with DH everything will be ready once you switch the nameservers to point to DH.
Few articles you may be interestedhttp://wiki.dreamhost.com/Host_a_subdomain_on_DreamHost_when_DNS_is_controlled_elsewhere