So you have 1050ti and want to buy new monitor.
1050ti isn't powerful GPU. So 144 Hz G-sync monitor doesn't worth it to buy.
I don't know if there are any low Hz (60 or 75 Hz) monitors with G-sync compatible. But again you don't need to buy them. 1050ti isn't capable for getting 60 or 75 FPS with Ultra settings on current games. You can lower the settings and use Vsync with cheaper 1080p 60 Hz monitor.
There is no equivalent GPU to 1050ti on AMD side.
RX550, RX460 and RX560 have lower performance compared to 1050ti.
RX470, RX570, RX480 and RX580 are much higher performer and pricier because of the GPU miners.