Which THCAD to use for Plasma cutter without voltage divider

I'm starting a CNC plasma build and have definitely decided on Linuxcnc as my controller but am totally new to Linux so learning rapidly!
I'm about to order the Mesa 7176 and THCAD but not sure which THCAD I should use. My plasma cutter is a Razorcut45 which doesn't have a voltage divider so I gather I can either use THCAD-300 or make myself a voltage divider to use THCAD-5 or THCAD-10. I've read that with a suitable voltage divider I will get better resolution from the THCAD-5 or THCAD-10 by using the whole voltage range.
Any advice would be appreciated before I buy my THCAD.

Do not know about the plasma, some info would be helpful or a PDF...
THCAD300 = can be used with no divider, not for use with HV/HF pilot arc plasma (it can be used, but risk of messing up high)
THCAD 10 = can be used for all plasma, needs just adding a 1MOhm resistor to each wire between plasma and THC (2 resistors total)
THCAD 5 same as THCAD 10 but i do not know the value of resistors ( venturing a guess at 2MOhm per side)

I'm about to order the Mesa 7176 and THCAD

Do you mean a 7i96 - as a 7i76 will require a 5i25 or 6i25 Or do you mean a 7i76e ?

This might also be of interest to you linuxcnc.org/docs/devel/html/plasma/qtplasmac.html

I was thinking of 7i76e, but again any advice on this vs 7i96 would be appreciated too.

this is the plasma I'm planning on using.
www.xcelarc.nz/product/razor-cut-45-plasma-cutter/

I know it's commonly used with the Langmuir crossfire CNC with their own THC system and from what I've read this is connected to full arc voltage. I'm tending towards the THCAD 10 but I'm sure there are others in the forum with a lot more knowledge on this than me...

My preferences would be:

THCAD-10 - if you decide later to add a CPC port you can still use the same card.

7i96 - unless you think you may need more I/O or that you may need MPG's for jogging.