Which model?

I’m fairly new to the sport, rode a season on a hard rail and then it was stolen. So now I’m in the market again and after some research have decided to go with the spectral. I’m not super familiar with all the components involved. I’m trying to figure out which of these would be the best bang for the buck.

Obviously the cheaper the better but I’d rather buy once than twice so if it’s best to just get one of the pricer ones rather than getting a cheaper one and then having to upgrade parts down the line I’d rather do that.

I included some used ones. If these get me more for less that would be great but if you advise not to risk it on a used one I can eliminate those.

Lastly, I want to get advice on sizing. I am a mere 5’7. The website suggests a small frame. I wanted to hear from other riders of this height I see if that is accurate or they feel better on a medium.

Thanks!