If I was porting an installation from one hosting company to another, I would NOT use a one-click install.
Use phpMyAdmin at ixwebhosting to export your mySQL data to a file, and save it on your desktop. Then save your files from ixwebhosting. If your installation is in /home/username/public_html, simply SSH in (which normally will put you in /home/username. Then execute
tar zcvf myapp.tgz public_html
(The "myapp.tgz" is the name you're giving your tarball. The "public_html" is the root of the directory tree you want to grab.) Then
cp myapp.tgz public_html
and download http://yourdomain.com/myapp.tgz to your desktop.
Upload myapp.tgz (binary mode) to your account here, to your root directory. If your app is supposed to sit in /home/username/frenchfries, SSH in to your home directory and execute
tar zxvf myapp.tgz
and it will create a directory named public_html.
and you will see what your files's ownership should be. If your username is fullyric, the files will be owned by fullyric (user) and somexyz (group). You need to execute the command
chown -R fullyric.somexyz public_html
in order to change the ownership of every file in the public_html tree. The permissions of the files will already be correct - that's the beauty of tarballs, that they save and restore permissions and directory trees.
You either need go to "manage domains" in the control panel and set things so that you're serving files out of public_html OR you need to rename the old directory you were serving files out of, and rename public_html to that name.
mv yourdomain.com yourdomain.old
mv public_html yourdomain.com
Create a mySQL database for your app in the Dreamhost control panel. Go into myPhpAdmin, and dump the data in your mySQL file into your new mySQL database.
OK, you're almost done. There will be a configuration file somewhere in your application. Often it has a name like config.php. If you look at the index.php file, you'll probably find that filename near the top.
You'll need to edit things to match your new web home.
1. You'll probably need to edit the "path" to your app's directory.
2. You'll probably need to edit the name of your mySQL database, the name of your mySQL user, the password of your mySQL user, and the name of your SQL server. ("Localhost" is used with most hosting companies, but not with DreamHost.)
Then when you're done, you may want to upgrade to a new version of WP. I'd suggest making that two steps, though, rather than trying to combining it into one.
If you're comfortable with SSH and myPhpAdmin, this should take you maybe an hour, even if you don't know anything about the WP architecture, and most of the time will be spent waiting for files to upload. If you're not, it'll take longer.
If you're uncomfortable with SSH and myPhpAdmin, you should be able to find someone willing to do this for you. Maybe you've got a friend, and your refrigerator contains more beer than it ought to? Or you can hire someone like me to do it for, oh, $50 or so.
Some will work cheaper than that, but you want to be careful who you get, because you're trusting someone with your passwords. Changing the password on your control panel is pretty easy, but changing the password on your mySQL user is less so.
I really recommend, though, that you do it yourself. You'd be learning skills that will be highly useful to you in the future.