In the new table wizard, click on the Columns tab, then press the "Add" button to add a column (which the dialog pops up). The drop down list of data types are not the same list of data types in the drop down as they are in the panel from which the "Add" was called. In the list column listing, select the drop down and many more are available.

Also, from a usability standpoint, when the "Add" button is pressed, go ahead an pop up the add column dialog so the user can start entering, don't make the user have double select the newly added column in the list to get that dialog to pop up.