new computer with parrelel port?

[JAZZCNC]

Ethernet motion control card ? Do you mean an ESS ? or something else?

I use several depending on machine and Pocket depth.?

My favorite for stepper systems by a long way is the CSlabs CSMIO IP-M or IP-S for servo machines. They cost more than the others but they are so much better for several reasons.
Quality is first rate and industrial strength with DIN rail mountings and wire connectors.
Runs on industry standard 24V so no extra supply needed.
No BOB required so removes one of the biggest causes of head aches with CNC machine.
Use's 24V I/O system along with differential outputs so is very noise immune. (Suits proximity switches nicely.)
Built in Anolgue spindle speed Control that is very stabile.
Great software and plug-in's with good support and updates.

Only thing with the CSMIO IP-M model is that you can't use slaved motors with it. So I only use this for 3 + 1 axis machines IE: 3 axis and 4th axis.
The IP-S supports slaved motors but cost's double the price and really is OTT for stepper systems and is aimed at servo systems, thou it will happily run steppers.

For slaved motor stepper machines then I use either ESS and PMDX BOB or for cheaper systems with don't require spinlde speed control then the Russian PLCM E3 and PLC6X.