Note, the 200GE is just a placeholder for a couple of months until Ryzen 3rd gen is out. The Ryzen 3300 would be a fantastic replacement CPU for like $100 as it will be similar to the 2600 (6C/12T) but with a higher clock speed. I would also suggest saving up for a decent 240gb SSD or you could go 240gb SSD now then grab a 2x4gb @3000 kit.
to answer your question about the GTx1050ti instead of the RX 570 video card or the one I selected the 1060 3GB
aside price, the performance of either o our cards are way above the 1050 ti video card.
as shown by PassMark scores below.
I think I read someone is having a sale on RX580 cards for $169? These are excellent GPUs, faster generally than even the GTX1060 (6 GB) cards...good for 1080P for ultra detail....for today's newest games, and, should prove competent at least a few years, IMO....