The motors for my heavy duty digital package will not work well with the g540 kit. The g540 only outputs 3.5 amps max. The motors (570) need 5 and (906) 6.1 amps to run at full torque. Running at less than rated amps will detune them basically weakening them, the 570 oz/in will detune to 399 oz/in and the 906 oz/in will detune to 520 oz/in. Steppers rated at 3.5 amps are good for the g540 such as the 381 oz/in stepper but these are a little weak for a g0704. You also have to keep in mind the inductance of the stepper, too high and it requires too high a supply voltage to run best at full speed. This is the reason for the packages with the motors on my site, they are matched for best performance.
If you want to use a laptop get an ethernet smoothstepper, no need for a parallel port and get a big boost in performance vs a parallel port only setup.
Shielded 4 wire 18awg makes for good motor cables, the end connectors depends on what box you get, some use db9 connectors, others the
4 pin connectors.
Hoss