#1 - This is personal preference. Start looking at lots of pics, and you'll soon realize which ones you like.
#2 & #3 - This link has pics of "cinnabees". The black pastel x spider is probably similar, if it has been made. I can't remember seeing one, but I'd be surprised if they haven't been made yet.
http://www.newenglandreptile.com/ner...ider-ball.html
#4 - Different lines of what? If you mean cinnamon and/or black pastel, then I believe the answer is yes. As far as I am aware, all cinnamons are compatible with each other, as are all black pastels. In fact, they are even all compatible with each other the same way a mojave is compatible with a lesser.