I'm not sure what you are wanting to do. Mobileme's functionality is email and keeping an iPhone synched. I see Apple is no longer accepting new subscriptions however, and sun-setting current use as of June 30, 2012. A year from now. Apple did announce iCloud coming in September which appears to be replacing mobileme.
Now why did I say all that? Because Dreamhost is not really a replacement for mobileme. You will not get things like hot synching of your calender and contacts. That can be done outside of mobileme, but i suspect iCloud will also handle it.
now that said, enjoy your Dreamhost account and Wordpress, but comparing mobileme and wordpress on dreamhost is like comparing.... well APPLES to ORANGES.