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I guess another point is portability. If you buy a 100mm refractor, it is a "nice" scope, and pretty portable, while an 8 inch dob is less so. But then again, for the cost of a 100mm refractor, you could get a 250mm dob and have money to spare. Meanwhile, a 100mm reflector (would have to be an EQ1 for that sort of size) would be not much more than a toy! Once a refractor gets much above 100mm, it starts to get pretty big....an 8 inch refractor would need a truck...but the truck would cost a lot less!
I guess this reinforces Starkler's view, you may be able to justify $500 on a dob and get a pretty big bucket. If you were interested in a refractor, you may be able to stretch the budget to a couple of grand and get a bucket that will hold a quarter of the photons! Four times the money to get a quarter of the light....factor of 16x. Mind you, I wouldn't say no to a nice "little" 120-150mm apo...would you?
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