Any USB/Ethernet controller suggestions?

[JAZZCNC]

Limit Switches
Home Switches
Probes
Pushbuttons
Sensors
E Stop
MPG
Pendants
Encoders

Let me expand this a little for you with rough some numbers. Many of these options you won't require but will be found on many CNC routers.
You'll also be surprised as you go along how many things you might like to add to the machine which require I/O and if you havent got them to start with it can be expensive or difficult adding them later. The little extra cost could be worth it long term.

INPUTS:
Home Switches = 4 (4 axis independant homing )
Limit Switches = 4 ( Independant axis sensing can be series wired to share 1 IN )
Probes = 1
Pushbuttons = 1 for each button required. ie: Feed hold, Cycle start, Step mode, Spindle on/off, Vac On/off, Coolant on/off, Air On/off
Sensors = 1 for each sensor. ie: ATC could easily use 6-12+ I/O dependant on style.
Rpm Sensor = 1
E Stop = 1
Servo Ready = 1
Servo fault = 1
Servo motor Stopped =1
Servo brake on/off = 1
MPG = 4 per axis for Simple hand wheel encoder plus 1 IN per function ie: Jog Mode, Step selection, E-stop
Encoders = 4 per axis (6 with Index)

Outputs:
Spindle on/off = 1
Spindle RPM = 1
Tool release = 1 (ATC)
ATC = 1 per action ie: Arm in/out, Arm up/down, Rotate, Clamp/release etc
Servo On/0ff = 1
Servo brake release = 1
Servo Reset = 1
Coolant on/off = 1
Vac on/off =1
Air on/off = 1
Pop up pins = 1
Dust hood retract = 1
Signal lights = 1 per Light ie: E-stop, Cycle start led, feed hold, Jog Mode etc