I got my first scope about 6 years ago, and it was a dob. I think it is perfect for a beginner, but i could understand wanting to upgrade(if that is the right word) to something with a goto mount if you wanted to do some photography, or if you don't like star-hopping(which can get frustrating when you first start). I'm happy with my Dob though, finding things is half of the fun
I would definitely say that if you do not get a goto scope, there is no point in getting anything other than a dob though. IMO, the perfect starter scope is the 130p Heritage. I'm not sure it's worth the extra for the 150p. I can say that it is very big and with a scope when you first start, being able to easily move it whenever you feel like is very important
The 130P is a great little scope, great for carrying around - but it's cheap for a reason. Not saying it's bad, or that you wouldn't be able to see anything in it, but the extra for the 150P makes a real difference; from the focuser to the solid tube to the extra aperture, everything's just that much better. So 130P = cheap and chereful, 150P = slightly less cheap but doesn't feel like a beginner scope, feels like a low end 'serious' scope.