I agree with you, Naomi! Ironing sheets on the bed is easier, faster and less stressful than using an ironing board. I'm so unlucky to be a total user with boards, it almost hurts my pride. Though I don't get it, what's wrong with your Rowenta? I have a steam iron from them, guess it's from Everlast, and it works so smoothly.
I prefer 100% cotton as you, Lyndsey, and NOT the high thread count (which makes them very thin and subject to wear out sooner). There is a brand at Bed Bath & Beyond like this, and they are wrinkle-resistant, but they don't have a brand name on them. Another option for guest beds - micro-fiber sheets from Steinmart and folks rave about how soft they are. They are not as thick, but hold up well for guest use. I think I paid $20 for queen a few months back. Additional bonus - folks think they are those super fancy very expensive sheets.
“A journey is best measured in friends rather than miles.” – Tim Cahill