Thanks for all your replies. I've looked at some of the irons mentioned and other I haven't seen so far. So more to research!
I contacted a manufacturer to ask why they recommend emptying after use. I *had* thought it was too relieve pressure on the tank. But they told me that emptying the water keeps the steam clean and reduces buildup of calcium deposits. IMHO, these issues can be resolved by regular use of the cleaning function. So maybe this doesn't have to be a factor.
I hear you all about using a spray bottle but my room is so tight that I am reluctant to do so because of overspray getting on furniture or the back of my sewing machine. I occasionally use Magic Sizing and recently noticed rusting on the hinges for the drop leaf on my sewing cabinet which is right behind my ironing board.
I'll keep looking and update once I've made a decision. Thanks again!