Given the current GPU market and what I'm seeing on PCpartpicker that will jump you from a 1050(8000) to a 1050 Ti(160000 and inho the small performance jump isn't worth it and a GTX 1060 or a RX480 or 580 is going to cost 28000+.
I'd go with the 1050 and wait for the bottom to fall out of Etherium mining then GPU prices should drop and normalize, when that happens you should be able to upgrade the gpu.