Discless for 500 and Disc version for 600 would really open Playstation to Xbox win. Lockhart 300 and Series X at 500 would possibly do a very strong competition.
The Series X is going to get killed at the same price point as a discless PS5. I could see being competitive with the Lockhart at $300 or even $400 as people would rather have a next gen system than a PS4 at that price. But at the same price point? Xbox has no chance.