I'd stay away from any pre-built PCs, there is a reason why it doesn't list many of the components like motherboard, psu. It's because they're usually cheapest crap you can find in the market. I mean the cpu is pretty bad too, might even bottleneck your graphics card.
TLDR: Build your own pc.
Just build yourself your own pc. Then you can decide what you want to have and hat you don't need. Also nowadays you can find cheap second hand grafic cards. The only question is if you are wanting to have a mining graphic card^^