I've used several Z-Wave dimmer switches. I prefer these Linear / GoControl switches:
https://www.amazon.com/gp/product/B00E1OVFAK
There is also a higher watt version:
https://www.amazon.com/gp/product/B01CW63380
I use mine with LED bulbs, so I'm not sure whether they will work with halogen bulbs. The description says they do.