First time 4K TV buyer looking for advice and suggestions.

As the title states, I plan to purchase my first 4K budget TV by the end of the month. I do not want to spend more than $600, but I am willing to spend a couple hundred more if anyone suggests any good TVs not listed in this post.

I am not interested in a TV larger than 50". I do not play video games at all. My main want and reason for purchasing a new TV is to have a better picture. I watch normal TV shows, college football and basketball, and motocross/supercross.

I went to Best Buy last weekend to look at a few different models on display. I went specifically to look at the Hisense 50" (model 50H8C). I also wanted to see the TCL 49" (model 49S405). The TCL was displayed on a rack away from the wall. I didn't spend much time at all looking at the TCL because I was more focused on the wall displayed TVs. I looked at the Hisense for maybe 30 seconds before a few other TVs caught my eye and impressed me more than the Hisense. These TVs being Vizio M series (M50-E1), a Sony 49x720e, and a Sony 49x800e. I spent the most time looking at the Vizio M series TV. I thought it looked the best of all the TVs I listed, but the Best Buy employee kept steering me in the direction of the Sony units. The Sony units may look better because, like I said, I spent by far the most time looking at the Vizio unit. I am going to go back to Best Buy this weekend and spend more time looking at the Hisense and Sony TVs. Can anyone here tell me how the Hisense, Sony, and Vizio TVs compare to each other? Reviews are good for the Vizio. I have read numerous review sites calling it the most bang for your buck budget 4K TV.

What about the Samsung 49" 7000 and 8000 series? The 8000 series Samsung price is definitely on the upper, upper end of what I am willing to spend for my first 4K TV.

I appreciate any and all advice and suggestions.

Thank you.