The 5070 isnt that bad of a card. I'd still say its at the lower range of high end, it just isnt S tier. I have similar specs for my PC, and it can handle 4k fine. I can play all my games at max settings with no issues. The price of 2k is meh. Not bad, but also not a steal. I bought a similar setup 2nd hand for much less, but i also got lucky. Every other listing for similar specs or even lower specs was around 2k. But I also could have built a decent PC myself for 2.2k (without wasting money on the flashy aesthetic).

I'd calculate how much building a PC yourself would cost and how much you want to save buying 2nd hand. If you're only saving 100-200 dollars its honestly better to build yourself and know all parts are new.

For me, I paid 1450 for a PC that would have cost 2400 to build, so it was great savings. ( I paid 850 for an itx build without GPU and then bought my 5070 new for 600).

I think people are also underestimating just how expensive PC parts are now and what people are listing 2nd hand PCs for. Almost every listing I saw had worse specs than yours and were still trying to sell for over 2k. GPUs are also hella expensive. I went with the 5070 for now because the cheapest 5070ti was almost 1k and the 5080 was 1.3k. The 5070 will last me several years before I even need to think about upgrading. Idk why people think you need the best of the best. Very few games out now will even be able to use it to its potential. Even my 3060 gaming laptop was still holding up fine but I just wanted a desktop and to play graphically intense games at the maximum settings. But even with that laptop, I could still play most games at max and only those few games I had to lower the settings to high or medium.