quite a few considerations to make hey, , all good advice above
Just adding that when choosing scopes, another consideration is what you want to mainly observe with it also. now, if you have good dark skies and wish to observe faint objects, like nebulae and distant galaxies, then, what we call a 'fast' scope is more suitable. the so called 'fast/speed' of a scope is determined by the F/Ratio of the scope, ie, an F/Ratio of 4 or 5, classified as F4 or F5 respectfully and are fast scopes which are best for faint nebs and galaxies etc, hence the need of reasonably dark skies, eg, relatively outer suburbs or country areas. tho if in the brighter subburbs, you may still see a few of the brighter nebulaes, but will struggle with hunting galaxies
On the other hand, some newtonians are classified as 'slow' scopes, meaning an F/Ratio of 7 or 8 - F7 or F8 - now these will struggle with nebulae and galaxies even in darkish skies, but the will do much better than the F4 or f5 scopes at viewing bright star clusters, planets, moon and with a solar filter, do a great job on the sun, but yeah, only ever look at the sun with proper solar filters, rather rewarding actually, plus you dont need dark skies for these slower scopes when viewing the above mentioned bright object, planets etc
Being a slower scope does not mean it is inferior to a fast scope, because they are designed for this type of visual observing, planets moon star clusters etc
Now, the F/6 ratio scope is in the middle and is what is probably the most popular as it is indetween a fast and slow scope, so its designed to get a bit of both worlds, a general good all round scope ! !
Newtonian = the actual scope, tube & mirror design
Dobsonian = the base that the newtonian scope sits on !
Hope this helps ?