I have a 10" Dobsonian. I bought it for about $500. I think that is reasonable for the aperture.
The newer dobs have encoders and computers so that you can easily find stellar objects. The only thing a dob won’t do is track the sky like a good equatorial mount although some have come up with contraptions to make a dob do so.
Orion make a decent dob here: Starter
Spend a few evenings at a dark sky site with one of these and a good field guide and you will be hooked.