Thank you all for your replies!
Yes, I would like to see something beyond the solar system, that's why I want to give as much money as it takes so that the nebulae and galaxies that are far away don't look like gray blurs. So as I understand it is better to exceed $500 so as not to be disappointed with what I will see.
I generally live in a city, but for more than 1 month a year I go to an island, so the telescope will be used there, and light pollution will not be a problem. Even in a dark sky, the DSOs looks like gray smudges? In fact, I am quite concerned about not being disappointed, the astronomy club in my city is not very active, I am waiting for a long time for them to answer me to go with them for some observation.
I also have a camera and I would like to use it, but I learned that the dobs aren't for deep sky astrophotography, is that true? And if so, what should my mount or the telescope have to take deep sky photos?
My main interest is observing the DSO through the telescope and not just taking pictures, but since I have a camera it will be very nice if I can use it.