You would measure worth as the following:
1. What is it worth to you?
2. Do similar PCs sell for about the same?
3. Is this a ready to use PC? That is, there is no OS listed and may folk struggle to install Windows and get the drivers all set for game play.
4. What monitor is being considered? The GPU looks awful for play on UHD 4K monitors.
Intel i5-9400F Hexa Core
ASUS GeForce Dual GTX 1660 TI 6GB
ASUS PRIME H310M-D
16GB DDR4 Ram
480GB SSD A400 Kingston
Toshiba 1TB P300 7200rpm 64MB SATA III
Exagon ATX Gaming RGB
834,00 € / 924.97$
my budget is like 700-850 € / 770-950$