I'm sorry but to my knowledge about rcurrently hot concert tix (like Taylor Swift) you might be unrealistic for decent seats and seeing the stage (and the faces) as anything but a fly spec for $50. You will undoubtedly be able to see a video on a large screen hanging from the ceiling of the faces and actions on the stage.
I found Stub Hub reliable though expesnive. On their website they show you floor plans so you can get an idea of where the available seats are that you potentially might be buying. It helps to know a bit about the stadium, too.
For example, in Tampa 2 yrs ago, I saw Carrie Underwood and the tickets were between $100-125 per seat. Those weren't exceptional seats but reasonable ones. I was close enough to be able to take so-so pix with my cell phone...LOL. Just giving you an example of what $100-$125 buys you in a venue at a large city like Tampa 2 yrs ago.
However, comparatively, in 2003 (I think) I saw Simon & Garfunkel with their reunion tour. We paid over $100 for those seats and the seats were nose-bleed level..but the big screen allowed us to see them. They brought out Everly Brothers for 3 songs. It was great but for the sake of perspective, that's what my dollar bought 9 yrs ago.