If money is not a problem then get the PM-30. It is a perfect size for a small shop and is a fine machine for most work and had long travels.
If you will really be only doing smaller parts the 704 is truly a great deal for what you get.
I have both and the 704 is just as well built but it is a small mill. If you need to save space and money just get it and you will be happy.
Or get both so you be covered..