SD,
A local friend got a new Axman Anderson boiler a few years ago. He picked up a bunch of radiators the size and decoration similar to the ones in your picture, from a salvage place. And like yours he did a beautiful job of cleaning and repainting them. He has a well insulated split level, but didn't like the baseboard heat because it gave up the heat too quickly causing parts of rooms to stay chilly areas.
He thought about using smaller radiators, he then figured that since he was breaking it up into zones, he could always adjust the temp/volume, if rooms got too hot. But, if they were too small he'd be screwed. With our central NY winters they worked out very well as large as your pictured one, without overheating rooms. They just kept the rooms warm that much longer.
Paul