Good advice above. I'd make a good quality 2" diagonal a priority. You'll definitely be wanting to use 2" eyepieces for your low power views. This 2" Astro-Physics SCT visual back advertised in the classifieds here is excellent and allows a full unrestricted opening, reducing vignetting for wide fields.
http://www.iceinspace.com.au/forum/s...d.php?t=142031
With a goto scope you only need the finder for the initial setup. No point in replacing it or in using a telrad. If you don't yet have a dew shield or heating strap, you will definitely need these. I have the William optics 2" crayford focuser and it doesn't collide with the base but I wouldn't consider it to be a necessity for visual use.