http://www.iceinspace.com.au/forum/s...ad.php?t=82049
Sometimes a brief run back though some of the recent topics will set you on the path of enlightenment
I think that thread will nail down exactly what you want to do apart from your question
The difference between the lense and the ED80.
Without knowing specifics of the lense most of the time is the difference in the objective lense ED Extra Dispersion what this ultimately means is that it has really good colour correction which will give you great images.
Setting up a german equitorial mount is hard for somebody who hasn't done it before but with experience to set up for wide field like yourself it shouldn't take much longer than about 10- 15 min to be in the ball park if your setting it up for larger focal lengths 300mm and up then you will be wanting to spend a little bit more time. There are programs that can help you nail down your alignment but seems though you have a dirty bright star pretty much telling you where your north celestial pole is
you have it easy unlike us with our hidden south celestial pole!
Good luck mate and welcome to our forum