Separating Grades?

Hi I am new to the site, just recently started separating my metals instead of all as "light iron" so I have a few questions...

I have copper wire and it varys in shine and color from bright orange to almost a red, is any of it worth more then the rest?

I have aluminum and it vary from clean electronic heat sinks to painted gutters and siding, is the painted aluminum worth less? Dull non-painted vs shiny?

I also have a bunch of mixed magnetic steel and iron, which I have been bringing as light iron however a lot of the electric motors have solid steel housings. Is the steel in solid chunks; a single casting worth more such as electric motors shells vs metal shelving?

Thanks!



ps- what are the top best scrap price chart websites online?