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Suzy,
The 6 inches is probably referring to the aperture (ie the diameter of the opening, mirror or main lens). The scope you posted a link to has a 60 mm (about 2.5") aperture. The reason a lot of people suggest a dob is because you get more aperture for your money than you do with a refractor. They are also much easier to set up than a typical scope on a german equatorial mount.
The scope you are looking at will be ok for moon and some planets but not great for nebulae as it has quite a small aperture so won't collect as much light as a larger scope.
Hope this helps!
Peter
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