Yes, especially in the widths you are talking about, the romans could get very heavy. We had to make sure they were well and truly fastened into the wall for the pressure/weight. Maybe rollers would be the way to go for you after all. I like your idea of a pelmet that's a fashion statement. Pelmets are good heating/cooling catchers as well I've read - reducing airflow over the windows.
We are still so undecided about what to get for our new house. DH hates curtains with a passion, and I have to admit, I want things more streamlined and less bulky. We think dual rollers in the front, but for the rest of the house, who knows. I'm sure we'll get there eventually!