At some point you will need to decide Astrophotography vs Visual.
RC8 - Speaking from experience (RC10") can be used for both but its designed as an astrograph. Collimation is a nightmare and @ F/8 you need pretty good mount/guiding package.
ED80 - This is f/7.5 scope and it has a smaller aperture so you will still need pretty good mount/guiding package. I'm not sure about the type of glass used or the configuration to comment on the colour correction. Information on this is flaky and the skywatcher site seems to be down.
If I had to choose between the two I'd go RC8 only because I cant tell glass configuration and Im sceptical of telescopes that are advertised as APO without detailing type of glass/config etc.
Finally, without knowing your budget its hard to recommend packages that suit your requirements. However, my preference for a starting Astrophotography/Visual would be scope /mount that is easy to setup, operate and takedown. So look for fast optics, easy collimation (if needed) and small setup which you can take dark site.
OTA - William Optics or Stellarvue refractor for widefield triplet refractors. OR Imaging Newt Bintel has few.
Mount - Any EQ Mount that matches weight of OTA camera. Long term you would want a good brand/quality so maybe consider modular design where worn parts can be replaced and purchased yourself. Losmandy would be my pick
Hope that helps