Hi,

I designed a FAN/LIGHT IR remote controller which had a tight BOM (cost) restriction so I had to use a TXR-Less PS and direct AC ZC sense. But for my other projects like thyristor controlled charger, Pro Dimmer I always use an Opto. So I would go with Steve. Infact while development and debug you can use a isolated PS (Txr based) and opto then when through with the code and hair falls convert it to dirt cheap.