Let me add two more comments.

1. If looking used, you need to have an idea of size that you need and to understand components, differences in frame design, differences in brands, etc. I bought used but spent at least a month of research (alot on thi forum) into road bikes to understand frames, components, sizes, etc.

2. It looks like you want something right now. If buying used, you are going to have to be patient and then be ready to pull the trigger quickly because the good deals don't last long. I found that often, the good deals lasted less than 24 hours on CL and sometimes no more than a few hours. I spent over a month looking on CL before I found a good deal and I only found it because it was a listing that fell between the cracks due to how it was listed.