I have a modified C-100 - it is now my daughter's...
VZ Grips fit fine and you have other sight options besides the CGW EZ/Drifts.
The stock gun sells for $329 at the local Academy... $300 seems a touch high for a used gun - I'd try to haggle
I bought ours used for $400 with 6 mags, a couple holsters, olive VZ Tactical Diamond grips, a CZ-USA Tactical rear sight with a tritium front sight. I sent the gun to CGW for the DCP kit and had David replace the tritium front sight with a fiber optic and crowned the barrel too.
Loved everything about the gun except the manual safety (not my cup of tea) and was going to sell it until my daughter shot it and claimed it as hers. She did decide to immediately replace the olive-colored grips with Pink Zebra VZs LOL
Great little guns!