I have the Bintel/GSO 8" F4. They come in under $500, but you will need to add a coma corrector ($250) and a set of catseye collimation tools ($300). F4 is not for the faint hearted when it comes to collimation and a Laser is not close enough.
I choose the Bintel/GSO over the Orion as I felt their standard focuser was better.
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