Well, it looks like I just went ahead and bought myself a nice mildly run in EOS 80D today!
It's a year old with 3000 clicks, comes with a year's warranty, some additions and has absolutely no marks or anything.
From reading this forum and your advice I think I'll have a great camera with this in my hands!
I'm absolutely on board with those who say I shouldn't possibly have had the issues I have with the EOS 550D, so I'll be sure to develop my skills and also put more effort and time in getting to know this camera. But I also agreed with those who said that if I was to put the effort in to get re-acquainted with the EOS 550D I might as well put that effort into a new camera and benefit from the advances in tech like focus and lighting (DR) and the video features etc. So that is why I decided to go this route.
Thanks for any and all advice. Now to save up for some more impressive glass. Seems like if you are willing to go second hand, there's some nice stuff not so far out of reach.