CNC 6040 Controller upgrading parts

[Palletlad]

OK I am looking at replacing the Chinese components in the control box to hopefully fix an issue with my machine jumping (checked frame for alignment and all seems in order) so possibly down to some electric noise or cheap board.
Now I have researched enough to attempt install the following however I don't know which to buy and gratefully ask for assistance:
a break out board (preferably with Ethernet connector)
3 stepper controllers
screened wiring
48v power supply
my only issue is I am on a budget and when looking at breakout boards/stepper controllers they vary in price greatly (cheapest BoB I have seen is £3 with most expensive BoB short of £100) smooth steppers pricing goes higher in three digits.
my price range I am looking at for a breakout board is around £50
for stepper motors around £20 each
screened wiring I just cant get my head round all the types I keep ending up looking at audio cables with 4 screened wires.
The screen shots are of my currant control box