Originally posted by photogem If you had a K10D you'd buy one of those lenses for it? Really?
OP didn't ask what lens to buy. They asked us what
we would take on a roadtrip if
we were only taking one lens. Or that's how I (and several others) interpreted it. If I misinterpreted the question, OP, sorry.
I also don't think it's a pointless thread. Asking questions like this is how people get to be more knowledgeable about photography and photographers. Indeed, I'm glad OP asked, because I'm somewhat interested in the answers of people more experienced than myself, or just those with different gear.
Although I will say this; with my interchangeable lens camera, I will pretty much always have more than one lens with me. At least back in the car in the parking lot of wherever I'm visiting.
But then, fiddling with the gear is almost as much a part of the hobby for me as the pictures are, and I don't care who knows it. Everyone enjoys things in their own way.