The difference between the VX and the CX, LX, DX and EX is only 7?F when the thermostat starts to open and only 9?F when the thermostat is fully open. I bought a replacement thermostat at a Honda dealer near me. The wait for a VX thermostat was a week if I recall correctly, so I went with a non-VX thermostat that I could get next day delivery on. That was 4 years ago. I see no noticeable difference in behavior/performance with the non-VX thermostat. The temperature gauge reads about the same too - the needle is at the 8:00 to 8:15 position.
Do yourself a favor and buy a Honda OEM thermostat. If you can wait for the VX thermostat do so but they have to be getting quite rare at the Honda parts warehouses. Maybe the HX used the same temperature range. I have noticed that the quality of aftermarket parts is getting worse and they fail earlier than factory parts.