I was going to suggest a Drift rose as well. My DH bought me a Coral Drift, it's quite pretty and looks like it would do very nicely as a weeper. Sprawls all over the ground.
Clematis don't take all that long to provide gratification.
This was the third year for my Crystal Fountain and Hagley Hybrid and they both grew to the top of my garden arch. They did pretty well last year, too. And they're so pretty!