Hey belthazor,
To answer your questions:
1) I like to use Verbatim, but I have had very good results with TDK as well. I may go and try Memorex as well being their CD-R's have served me quite well.
Do I prefer - or + R? Well depends... From what I know (which is not a whole lot about it
) is that the only main difference between the two formats is the file structure and handling... Obviously the -R is cheaper at this point. So far, I have only been burning with +R's and I have yet to burn a coaster. I too have the 708A... Now if only I can find a whole bunch of 8x +R's that do not cost $5 per 1 DVD - then all will be well!
I myself would like to know more about the differences between the formats -/+ R...
2) Take a look at these 2 links...
Part 1: hxxp://www.techimo.com/articles/index.pl?photo=136
Part 2: hxxp://www.techimo.com/articles/index.pl?photo=137
I hope this help you out some. Enjoy the new Plextor!
-SlickVic78