On my laptop I prefer number 2 and 6. I don't know if there is a "correct" way of processing Ken. If I processes something on my laptop and then view it on my desktop, often while looking fine on the laptop it will look terrible on the desktop, but not necessarily visa versa. For me each monitor shows an object differently. Also processing is a very personal thing. I'll often prefer an image that doesn't show as much colour or detail over a different processing if the second one has clipped stars and bright objects. To me it doesn't look as natural.
Hope that helps
